\specialappbegin F. {Font tables}
\def\¬{\char'16 }
{\bf 1. Standard ``ascii'' code.}\xskip The American Standard Code for Information
Inter\-change deals with
characters that print and actions that don't.
The following table of 128 codes shows ``control'' symbols for codes \¬001
to \¬032, since many computer terminals generate these symbols when
the typist holds the control key down when typing a letter. These 26 codes also
have other names not shown here; for example, {\≡↑G≡\} (control-G) is also called
{\tt BEL} (ring the bell). It is rarely possible to transmit all 128 of these
symbols from your terminal to a computer and vice versa---something strange usually
happens to a few of them. But the most important ones get through.

\vfill
\moveright26pt\vbox{
\hbox{\hbox to 40pt{\hfill0\hfill}\!
\hbox to 40pt{\hfill1\hfill}\!
\hbox to 40pt{\hfill2\hfill}\!
\hbox to 40pt{\hfill3\hfill}\!
\hbox to 40pt{\hfill4\hfill}\!
\hbox to 40pt{\hfill5\hfill}\!
\hbox to 40pt{\hfill6\hfill}\!
\hbox to 40pt{\hfill7\hfill}}
\vskip 4pt
\hrule
\def\|{\vrule height 10.5pt depth 4.5pt}
\halign{\hbox to 0pt{\hskip -24pt\¬#0\hfill}&\|
\hbox to 40pt{\hfill#\hfill\|}&\!
\hbox to 40pt{\hfill#\hfill\|}&\!
\hbox to 40pt{\hfill#\hfill\|}&\!
\hbox to 40pt{\hfill#\hfill\|}&\!
\hbox to 40pt{\hfill#\hfill\|}&\!
\hbox to 40pt{\hfill#\hfill\|}&\!
\hbox to 40pt{\hfill#\hfill\|}&\!
\hbox to 40pt{\hfill#\hfill\|}\cr
00&{\≡NUL≡\}&{\≡↑A≡\}&{\≡↑B≡\}&{\≡↑C≡\}&{\≡↑D≡\}&{\≡↑E≡\}&{\≡↑F≡\}&{\≡↑G≡\}\cr
\noalign{\hrule}
01&{\≡↑H≡\}&{\≡↑I≡\}&{\≡↑J≡\}&{\≡↑K≡\}&{\≡↑L≡\}&{\≡↑M≡\}&{\≡↑N≡\}&{\≡↑O≡\}\cr
\noalign{\hrule}
02&{\≡↑P≡\}&{\≡↑Q≡\}&{\≡↑R≡\}&{\≡↑S≡\}&{\≡↑T≡\}&{\≡↑U≡\}&{\≡↑V≡\}&{\≡↑W≡\}\cr
\noalign{\hrule}
03&{\≡↑X≡\}&{\≡↑Y≡\}&{\≡↑Z≡\}&{\≡ESC≡\}&{\≡FS≡\}&{\≡GS≡\}&{\≡RS≡\}&{\≡US≡\}\cr
\noalign{\hrule}
04&{\≡SP≡\}&{\≡!≡\}&{\≡"≡\}&{\≡#≡\}&{\≡$≡\}&{\≡%≡\}&{\≡&≡\}&{\≡≡'≡\}\cr
\noalign{\hrule}
05&{\≡(≡\}&{\≡)≡\}&{\≡*≡\}&{\≡+≡\}&{\≡,≡\}&{\≡-≡\}&{\≡.≡\}&{\≡/≡\}\cr
\noalign{\hrule}
06&{\≡0≡\}&{\≡1≡\}&{\≡2≡\}&{\≡3≡\}&{\≡4≡\}&{\≡5≡\}&{\≡6≡\}&{\≡7≡\}\cr
\noalign{\hrule}
07&{\≡8≡\}&{\≡9≡\}&{\≡:≡\}&{\≡;≡\}&{\≡<≡\}&{\≡=≡\}&{\≡>≡\}&{\≡?≡\}\cr
\noalign{\hrule}
10&{\≡@≡\}&{\≡A≡\}&{\≡B≡\}&{\≡C≡\}&{\≡D≡\}&{\≡E≡\}&{\≡F≡\}&{\≡G≡\}\cr
\noalign{\hrule}
11&{\≡H≡\}&{\≡I≡\}&{\≡J≡\}&{\≡K≡\}&{\≡L≡\}&{\≡M≡\}&{\≡N≡\}&{\≡O≡\}\cr
\noalign{\hrule}
12&{\≡P≡\}&{\≡Q≡\}&{\≡R≡\}&{\≡S≡\}&{\≡T≡\}&{\≡U≡\}&{\≡V≡\}&{\≡W≡\}\cr
\noalign{\hrule}
13&{\≡X≡\}&{\≡Y≡\}&{\≡Z≡\}&{\≡[≡\}&{\≡\≡\}&{\≡]≡\}&{\≡≡char'17≡\}&$_$\cr
\noalign{\hrule}
14&{\≡≡`≡\}&{\≡a≡\}&{\≡b≡\}&{\≡c≡\}&{\≡d≡\}&{\≡e≡\}&{\≡f≡\}&{\≡g≡\}\cr
\noalign{\hrule}
15&{\≡h≡\}&{\≡i≡\}&{\≡j≡\}&{\≡k≡\}&{\≡l≡\}&{\≡m≡\}&{\≡n≡\}&{\≡o≡\}\cr
\noalign{\hrule}
16&{\≡p≡\}&{\≡q≡\}&{\≡r≡\}&{\≡s≡\}&{\≡t≡\}&{\≡u≡\}&{\≡v≡\}&{\≡w≡\}\cr
\noalign{\hrule}
17&{\≡x≡\}&{\≡y≡\}&{\≡z≡\}&{\≡{≡\}&{\≡|≡\}&{\≡}≡\}&{\≡≡char'24≡\}&{\≡DEL≡\}\cr}
\hrule}
\eject
\noindent{\bf 2. Stanford ``SUAI'' code.}\xskip The following table of 128
codes (developed about 1965 at the Stanford Artificial Intelligence Laboratory)
applies to numerous devices now used in the vicinity of Stanford University.
For the most part it is ascii code but extended to include more printing
characters. There's an unfortunate discrepancy, however, with respect
to ``{\≡}≡\}'' (\¬175 in ascii, \¬176 at SUAI); also
``{\≡≡char'24≡\}'' (\¬176 in ascii, something like \¬032 at SUAI);
also ``{\≡≡char'17≡\}'' (\¬136 in ascii, something like \¬004 at SUAI); and also
``$_$'' (\¬137 in ascii, \¬030 at SUAI).
Essentially the same code is used at Carnegie-Mellon University and at
the University of Southern California, but with
\¬176 and \¬175 switched. At the Massachusetts Institute of
Technology the code is somewhat the same but there are ten discrepancies:
codes \¬010, \¬013, \¬030, \¬032, \¬033, \¬136, \¬137, \¬175, \¬176, \¬177
are respectively called {\tt BS}, $\up$, $←$, $≠$, {\tt ESC}, \char'17,
$_$, $\}$, \char'24, {\tt DEL}.

\vfill
\moveright26pt\vbox{
\hbox{\hbox to 40pt{\hfill0\hfill}\!
\hbox to 40pt{\hfill1\hfill}\!
\hbox to 40pt{\hfill2\hfill}\!
\hbox to 40pt{\hfill3\hfill}\!
\hbox to 40pt{\hfill4\hfill}\!
\hbox to 40pt{\hfill5\hfill}\!
\hbox to 40pt{\hfill6\hfill}\!
\hbox to 40pt{\hfill7\hfill}}
\vskip 4pt
\hrule
\def\|{\vrule height 10.5pt depth 4.5pt}
\halign{\hbox to 0pt{\hskip -24pt\¬#0\hfill}&\|
\hbox to 40pt{\hfill#\hfill\|}&\!
\hbox to 40pt{\hfill#\hfill\|}&\!
\hbox to 40pt{\hfill#\hfill\|}&\!
\hbox to 40pt{\hfill#\hfill\|}&\!
\hbox to 40pt{\hfill#\hfill\|}&\!
\hbox to 40pt{\hfill#\hfill\|}&\!
\hbox to 40pt{\hfill#\hfill\|}&\!
\hbox to 40pt{\hfill#\hfill\|}\cr
00&\tt NUL&$\down$&$α$&$β$&$∧$&$¬$&$\in$&$π$\cr
\noalign{\hrule}
01&$λ$&\tt TAB&\tt LF&\tt VT&\tt FF&\tt CR&$∞$&$∂$\cr
\noalign{\hrule}
02&$⊂$&$⊃$&$∩$&$∪$&$∀$&$∃$&$\otimes$&$↔$\cr
\noalign{\hrule}
03&$_$&$→$&$~$&$≠$&$≤$&$≥$&$≡$&$∨$\cr
\noalign{\hrule}
04&\tt SP&!&\tt "&$\#$&$\$$&\%&&&'\cr
\noalign{\hrule}
05&(&)&*&+&,&-&.&/\cr
\noalign{\hrule}
06&0&1&2&3&4&5&6&7\cr
\noalign{\hrule}
07&8&9&:&;&<&=&>&?\cr
\noalign{\hrule}
10&$\@$&A&B&C&D&E&F&G\cr
\noalign{\hrule}
11&H&I&J&K&L&M&N&O\cr
\noalign{\hrule}
12&P&Q&R&S&T&U&V&W\cr
\noalign{\hrule}
13&X&Y&Z&[&$\rslash$&]&$\up$&$←$\cr
\noalign{\hrule}
14&`&a&b&c&d&e&f&g\cr
\noalign{\hrule}
15&h&i&j&k&l&m&n&o\cr
\noalign{\hrule}
16&p&q&r&s&t&u&v&w\cr
\noalign{\hrule}
17&x&y&z&$\{$&$|$&\tt ALT&$\}$&\tt BS\cr}
\hrule}
\eject
\noindent{\bf 3. \TeX\ standard roman fonts.}\xskip The following table of 128
codes shows the form \TeX\ expects its fonts to have when you use
the control sequences
for accents and special foreign letters listed in Chapter 9, or when you use
the control sequences for upper case Greek letters listed later in this appendix.\!
\xskip(Actually \TeX\ never addresses codes \¬042, \¬134, \¬136, \¬137, and \¬173 to
\¬177
directly; they are accessed indirectly via ligature information stored within
the font itself.)\xskip Codes \¬043 and \¬044 are undefined; special characters
needed in particular jobs (e.g., inverted ``?'' and ``!'' for
Spanish text) might be placed there. Note that there is agreement
with ascii code on all of its printing characters except for $\#$, $\$$, $\@$,
$\rslash$, \char'17, $_$, $\{$, $|$, $\}$, and $~$, which \TeX\ gets from
its ``symbol'' fonts. The same codes are used for slanted roman fonts like cms10,
and for text italic fonts like cmti10.

\vfill
\moveright26pt\vbox{
\def\\{\char'}
\hbox{\hbox to 40pt{\hfill0\hfill}\!
\hbox to 40pt{\hfill1\hfill}\!
\hbox to 40pt{\hfill2\hfill}\!
\hbox to 40pt{\hfill3\hfill}\!
\hbox to 40pt{\hfill4\hfill}\!
\hbox to 40pt{\hfill5\hfill}\!
\hbox to 40pt{\hfill6\hfill}\!
\hbox to 40pt{\hfill7\hfill}}
\vskip 4pt
\hrule
\def\|{\vrule height 10.5pt depth 4.5pt}
\halign{\hbox to 0pt{\hskip -24pt\¬#0\hfill}&\|
\hbox to 40pt{\hfill#\hfill\|}&\!
\hbox to 40pt{\hfill#\hfill\|}&\!
\hbox to 40pt{\hfill#\hfill\|}&\!
\hbox to 40pt{\hfill#\hfill\|}&\!
\hbox to 40pt{\hfill#\hfill\|}&\!
\hbox to 40pt{\hfill#\hfill\|}&\!
\hbox to 40pt{\hfill#\hfill\|}&\!
\hbox to 40pt{\hfill#\hfill\|}\cr
00&\\000&\\001&\\002&\\003&\\004&\\005&\\006&\\007\cr
\noalign{\hrule}
01&\\010&\\011&\\012&\\013&\\014&\\015&\\016&\\017\cr
\noalign{\hrule}
02&\\020&\\021&\\022&\\023&\\024&\\025&\\026&\\027\cr
\noalign{\hrule}
03&\\030&\\031&\\032&\\033&\\034&\\035&\\036&\\037\cr
\noalign{\hrule}
04&\\040&\\041&\\042&\:fundefined&\:fundefined&\\045&\\046&\\047\cr
\noalign{\hrule}
05&\\050&\\051&\\052&\\053&\\054&\\055&\\056&\\057\cr
\noalign{\hrule}
06&\\060&\\061&\\062&\\063&\\064&\\065&\\066&\\067\cr
\noalign{\hrule}
07&\\070&\\071&\\072&\\073&\\074&\\075&\\076&\\077\cr
\noalign{\hrule}
10&\\100&\\101&\\102&\\103&\\104&\\105&\\106&\\107\cr
\noalign{\hrule}
11&\\110&\\111&\\112&\\113&\\114&\\115&\\116&\\117\cr
\noalign{\hrule}
12&\\120&\\121&\\122&\\123&\\124&\\125&\\126&\\127\cr
\noalign{\hrule}
13&\\130&\\131&\\132&\\133&\\134&\\135&\\136&\\137\cr
\noalign{\hrule}
14&\\140&\\141&\\142&\\143&\\144&\\145&\\146&\\147\cr
\noalign{\hrule}
15&\\150&\\151&\\152&\\153&\\154&\\155&\\156&\\157\cr
\noalign{\hrule}
16&\\160&\\161&\\162&\\163&\\164&\\165&\\166&\\167\cr
\noalign{\hrule}
17&\\170&\\171&\\172&\\173&\\174&\\175&\\176&\\177\cr}
\hrule}
\eject
\noindent{\bf 4. \TeX\ typewriter fonts.}\xskip Fixed-width fonts such as the
cmtt font shown below are sort of a cross between \TeX\ roman and SUAI codes.
All the accents and special characters of a \TeX\ roman font are present except
for {\≡\b≡\}, {\≡\l≡\}, {\≡\o≡\}, {\≡\t≡\}, {\≡\H≡\}, and {\≡\O≡\}; and every
ascii printing character is present.\xskip (SUAI code instead of ascii code is,
however, used for the character ``{\≡}≡\}'', and \TeX\ roman code is used for
``{\tt\char'24}''.)\xskip All SUAI characters that appear in these fonts appear
in their SUAI positions, except for {\≡≡∞≡\}, {\tt\char'24}, {\tt\char'32},
and {\≡≡↓≡\}.\xskip (Furthermore you may prefer to use codes \¬015 and \¬016 in
place of \¬140 and \¬047, as done in the examples of this manual.)


\vfill
\moveright26pt\vbox{
\def\\{\char'}
\hbox{\hbox to 40pt{\hfill0\hfill}\!
\hbox to 40pt{\hfill1\hfill}\!
\hbox to 40pt{\hfill2\hfill}\!
\hbox to 40pt{\hfill3\hfill}\!
\hbox to 40pt{\hfill4\hfill}\!
\hbox to 40pt{\hfill5\hfill}\!
\hbox to 40pt{\hfill6\hfill}\!
\hbox to 40pt{\hfill7\hfill}}
\vskip 4pt
\hrule
\def\|{\vrule height 10.5pt depth 4.5pt}
\halign{\hbox to 0pt{\hskip -24pt\¬#0\hfill}&\|
\hbox to 40pt{\hfill\:t#\hfill\|}&\!
\hbox to 40pt{\hfill\:t#\hfill\|}&\!
\hbox to 40pt{\hfill\:t#\hfill\|}&\!
\hbox to 40pt{\hfill\:t#\hfill\|}&\!
\hbox to 40pt{\hfill\:t#\hfill\|}&\!
\hbox to 40pt{\hfill\:t#\hfill\|}&\!
\hbox to 40pt{\hfill\:t#\hfill\|}&\!
\hbox to 40pt{\hfill\:t#\hfill\|}\cr
00&\\000&\\001&\\002&\\003&\\004&\\005&\\006&\\007\cr
\noalign{\hrule}
01&\\010&\\011&\\012&\\013&\\014&\\015&\\016&\\017\cr
\noalign{\hrule}
02&\\020&\\021&\\022&\\023&\\024&\\025&\\026&\\027\cr
\noalign{\hrule}
03&\\030&\\031&\\032&\\033&\\034&\\035&\\036&\\037\cr
\noalign{\hrule}
04&\\040&\\041&\\042&\\043&\\044&\\045&\\046&\\047\cr
\noalign{\hrule}
05&\\050&\\051&\\052&\\053&\\054&\\055&\\056&\\057\cr
\noalign{\hrule}
06&\\060&\\061&\\062&\\063&\\064&\\065&\\066&\\067\cr
\noalign{\hrule}
07&\\070&\\071&\\072&\\073&\\074&\\075&\\076&\\077\cr
\noalign{\hrule}
10&\\100&\\101&\\102&\\103&\\104&\\105&\\106&\\107\cr
\noalign{\hrule}
11&\\110&\\111&\\112&\\113&\\114&\\115&\\116&\\117\cr
\noalign{\hrule}
12&\\120&\\121&\\122&\\123&\\124&\\125&\\126&\\127\cr
\noalign{\hrule}
13&\\130&\\131&\\132&\\133&\\134&\\135&\\136&\\137\cr
\noalign{\hrule}
14&\\140&\\141&\\142&\\143&\\144&\\145&\\146&\\147\cr
\noalign{\hrule}
15&\\150&\\151&\\152&\\153&\\154&\\155&\\156&\\157\cr
\noalign{\hrule}
16&\\160&\\161&\\162&\\163&\\164&\\165&\\166&\\167\cr
\noalign{\hrule}
17&\\170&\\171&\\172&\\173&\\174&\\175&\\176&\\177\cr}
\hrule}
\eject
\noindent{\bf 5. \TeX\ standard math italic fonts.}\xskip The following table
of 128 codes shows the form \TeX\ expects the italic ({\tt it}) fonts to have
in math mode, if you use the control sequences for lower case Greek letters,
upper case italic Greek letters, and a few other special symbols listed later
in this appendix. Note that there is agreement with ascii code
on all of its printing characters, except for the \%\ sign and the
ten symbols that are missing in \TeX\ roman fonts (see the
previous pages).

\vfill
\moveright26pt\vbox{
\def\\{\char'}
\hbox{\hbox to 40pt{\hfill0\hfill}\!
\hbox to 40pt{\hfill1\hfill}\!
\hbox to 40pt{\hfill2\hfill}\!
\hbox to 40pt{\hfill3\hfill}\!
\hbox to 40pt{\hfill4\hfill}\!
\hbox to 40pt{\hfill5\hfill}\!
\hbox to 40pt{\hfill6\hfill}\!
\hbox to 40pt{\hfill7\hfill}}
\vskip 4pt
\hrule
\def\|{\vrule height 10.5pt depth 4.5pt}
\halign{\hbox to 0pt{\hskip -24pt\¬#0\hfill}&\|
\hbox to 40pt{\hfill\:g#\hfill\|}&\!
\hbox to 40pt{\hfill\:g#\hfill\|}&\!
\hbox to 40pt{\hfill\:g#\hfill\|}&\!
\hbox to 40pt{\hfill\:g#\hfill\|}&\!
\hbox to 40pt{\hfill\:g#\hfill\|}&\!
\hbox to 40pt{\hfill\:g#\hfill\|}&\!
\hbox to 40pt{\hfill\:g#\hfill\|}&\!
\hbox to 40pt{\hfill\:g#\hfill\|}\cr
00&\\000&\\001&\\002&\\003&\\004&\\005&\\006&\\007\cr
\noalign{\hrule}
01&\\010&\\011&\\012&\\013&\\014&\\015&\\016&\\017\cr
\noalign{\hrule}
02&\\020&\\021&\\022&\\023&\\024&\\025&\\026&\\027\cr
\noalign{\hrule}
03&\\030&\\031&\\032&\\033&\\034&\\035&\\036&\\037\cr
\noalign{\hrule}
04&\\040&\\041&\\042&\\043&\\044&\\045&\\046&\\047\cr
\noalign{\hrule}
05&\\050&\\051&\\052&\\053&\\054&\\055&\\056&\\057\cr
\noalign{\hrule}
06&\\060&\\061&\\062&\\063&\\064&\\065&\\066&\\067\cr
\noalign{\hrule}
07&\\070&\\071&\\072&\\073&\\074&\\075&\\076&\\077\cr
\noalign{\hrule}
10&\\100&\\101&\\102&\\103&\\104&\\105&\\106&\\107\cr
\noalign{\hrule}
11&\\110&\\111&\\112&\\113&\\114&\\115&\\116&\\117\cr
\noalign{\hrule}
12&\\120&\\121&\\122&\\123&\\124&\\125&\\126&\\127\cr
\noalign{\hrule}
13&\\130&\\131&\\132&\\133&\:fundefined&\\135&\:fundefined&\:fundefined\cr
\noalign{\hrule}
14&\\140&\\141&\\142&\\143&\\144&\\145&\\146&\\147\cr
\noalign{\hrule}
15&\\150&\\151&\\152&\\153&\\154&\\155&\\156&\\157\cr
\noalign{\hrule}
16&\\160&\\161&\\162&\\163&\\164&\\165&\\166&\\167\cr
\noalign{\hrule}
17&\\170&\\171&\\172&\\173&\\174&\\175&\\176&\\177\cr}
\hrule}
\eject
\noindent{\bf 6. \TeX\ standard math symbol fonts.}\xskip The following
table of 128 codes shows the form \TeX\ expects the symbol ({\tt sy}) fonts
to have in math mode, if you use the control sequences for various special
symbols listed later in this appendix, or if you use special keys on your
terminal in math mode as explained below in subsection 8. Several positions
are undefined; they can be filled with any special characters
that might be needed in a particular job. The character in position
\¬100, which is used to negate a relation, has zero width.

\vfill
\moveright26pt\vbox{
\def\\{\char'}
\hbox{\hbox to 40pt{\hfill0\hfill}\!
\hbox to 40pt{\hfill1\hfill}\!
\hbox to 40pt{\hfill2\hfill}\!
\hbox to 40pt{\hfill3\hfill}\!
\hbox to 40pt{\hfill4\hfill}\!
\hbox to 40pt{\hfill5\hfill}\!
\hbox to 40pt{\hfill6\hfill}\!
\hbox to 40pt{\hfill7\hfill}}
\vskip 4pt
\hrule
\def\|{\vrule height 10.5pt depth 4.5pt}
\halign{\hbox to 0pt{\hskip -24pt\¬#0\hfill}&\|
\hbox to 40pt{\hfill\:u#\hfill\|}&\!
\hbox to 40pt{\hfill\:u#\hfill\|}&\!
\hbox to 40pt{\hfill\:u#\hfill\|}&\!
\hbox to 40pt{\hfill\:u#\hfill\|}&\!
\hbox to 40pt{\hfill\:u#\hfill\|}&\!
\hbox to 40pt{\hfill\:u#\hfill\|}&\!
\hbox to 40pt{\hfill\:u#\hfill\|}&\!
\hbox to 40pt{\hfill\:u#\hfill\|}\cr
00&\\000&\\001&\\002&\\003&\\004&\\005&\\006&\\007\cr
\noalign{\hrule}
01&\\010&\\011&\\012&\\013&\\014&\\015&\\016&\\017\cr
\noalign{\hrule}
02&\\020&\\021&\\022&\\023&\\024&\\025&\\026&\\027\cr
\noalign{\hrule}
03&\\030&\\031&\\032&\\033&\\034&\\035&\\036&\\037\cr
\noalign{\hrule}
04&\\040&\\041&\\042&\\043&\\044&\\045&\\046&\\047\cr
\noalign{\hrule}
05&\\050&\\051&\\052&\\053&\\054&\\055&\\056&\\057\cr
\noalign{\hrule}
06&\\060&\\061&\\062&\\063&\\064&\\065&\\066&\:fundefined\cr
\noalign{\hrule}
07&\\070&\\071&\\072&\\073&\\074&\\075&\\076&\:fundefined\cr
\noalign{\hrule}
10&\\100&\\101&\\102&\\103&\\104&\\105&\\106&\\107\cr
\noalign{\hrule}
11&\\110&\\111&\\112&\\113&\\114&\\115&\\116&\\117\cr
\noalign{\hrule}
12&\\120&\\121&\\122&\\123&\\124&\\125&\\126&\\127\cr
\noalign{\hrule}
13&\\130&\\131&\\132&\\133&\\134&\\135&\\136&\\137\cr
\noalign{\hrule}
14&\\140&\\141&\\142&\\143&\\144&\\145&\\146&\\147\cr
\noalign{\hrule}
15&\\150&\\151&\\152&\\153&\\154&\\155&\:fundefined&\:fundefined\cr
\noalign{\hrule}
16&\\160&\\161&\\162&\\163&\\164&\\165&\\166&\:fundefined\cr
\noalign{\hrule}
17&\\170&\\171&\\172&\\173&\\174&\\175&\\176&\\177\cr}
\hrule}
\eject
\noindent{\bf 7. \TeX\ standard math extension fonts.}\xskip The table of
128 codes on the next page
shows the form \TeX\ expects the extension ({\tt ex}) font to
have in math mode, if you use variable delimiters or the control
sequences for large operators listed later in this appendix.

\vfill
{\def\bracex{\leaders\hrule height 1.5pt \hfill}
\def\dnbrace{$\char'772$\bracex$\char'775
              \char'774$\bracex$\char'773$}
\def\upbrace{$\char'774$\bracex$\char'773
              \char'772$\bracex$\char'775$}
\hbox to size{\hfill\hbox to 250pt{\dnbrace}\hfill}
\vskip6pt
\hbox to size{\hfill$\left\{\hskip6pt\vcenter{
\hbox par 250pt{Actually
\TeX\ addresses most of these characters indirectly; for example, all
left parentheses are addressed starting with character \¬000, based on
information stored in the font itself, and the font also tells \TeX\
that arbitrarily large left parentheses can be made from characters
\¬060 (top), \¬102 (middle), \¬100 (bottom). The only codes explicitly
referred to by \TeX\ are \¬000 to \¬016, \¬110, \¬112, \¬114, \¬116,
\¬120 to \¬127, and \¬160. Thus, a font designer can move most of the
other symbols if desired, subject only to the restriction that the code number
of a large symbol be greater than the code numbers
of its smaller variants.\xskip (If
codes are changed, however, it may be necessary to change the definitions of
control sequences like {\≡\bigglp≡\} in Appendix B.)\xskip It is expected that positions
marked ``{\:fundefined}'' in this chart will be filled with characters specially
tailored to specific jobs; for example, character \¬177 is used for the
``dangerous bend'' symbol in this manual, but it might not be present in
all \TeX\ extension fonts.}}\hskip6pt\right\}$\hfill}
\vskip6pt
\hbox to size{\hfill\hbox to 250pt{\upbrace}\hfill}}
\vfill
\eject

\vfill
\moveright26pt\vbox{
\def\\{\char'}
\hbox{\hbox to 40pt{\hfill0\hfill}\!
\hbox to 40pt{\hfill1\hfill}\!
\hbox to 40pt{\hfill2\hfill}\!
\hbox to 40pt{\hfill3\hfill}\!
\hbox to 40pt{\hfill4\hfill}\!
\hbox to 40pt{\hfill5\hfill}\!
\hbox to 40pt{\hfill6\hfill}\!
\hbox to 40pt{\hfill7\hfill}}
\vskip 4pt
\hrule
\def\0{\vrule height 7.5pt depth 2.5pt}
\def\1{\vrule height 10pt depth 5pt}
\def\2{\vrule height 14.5pt depth 9.5pt}
\def\3{\vrule height 17.5pt depth 12.5pt}
\def\4{\vrule height 20.5pt depth 15.5pt}
\halign{\hbox to 0pt{\hskip -24pt$\vcenter{\hbox{\¬#0}}$\hfill}&\!
#&\hbox to 39.6pt{\hfill$\vcenter{\hbox{\:@#}}$\hfill}&\!
#&\hbox to 39.6pt{\hfill$\vcenter{\hbox{\:@#}}$\hfill}&\!
#&\hbox to 39.6pt{\hfill$\vcenter{\hbox{\:@#}}$\hfill}&\!
#&\hbox to 39.6pt{\hfill$\vcenter{\hbox{\:@#}}$\hfill}&\!
#&\hbox to 39.6pt{\hfill$\vcenter{\hbox{\:@#}}$\hfill}&\!
#&\hbox to 39.6pt{\hfill$\vcenter{\hbox{\:@#}}$\hfill}&\!
#&\hbox to 39.6pt{\hfill$\vcenter{\hbox{\:@#}}$\hfill}&\!
#&\hbox to 39.6pt{\hfill$\vcenter{\hbox{\:@#}}$\hfill}&\!
#&\hbox to 39.6pt{\hfill$\vcenter{\hbox{\:@#}}$\hfill}&#\cr
00&\1&\\000&\1&\\001&\1&\\002&\1&\\003&\1&\\004&\1&\\005&\1&\\006&\1&\\007&\1\cr
\noalign{\hrule}
01&\1&\\010&\1&\\011&\1&\\012&\1&\\013&\1&\\014&\1&\\015&\1&\\016&\1&\:f
undefined&\1\cr
\noalign{\hrule}
02&\3&\\020&\3&\\021&\3&\\022&\3&\\023&\3&\\024&\3&\\025&\3&\\026&\3&\\027&\3\cr
\noalign{\hrule}
03&\3&\\030&\3&\\031&\3&\\032&\3&\\033&\3&\\034&\3&\\035&\3&\\036&\3&\:f
undefined&\3\cr
\noalign{\hrule}
04&\4&\\040&\4&\\041&\4&\\042&\4&\\043&\4&\\044&\4&\\045&\4&\\046&\4&\\047&\4\cr
\noalign{\hrule}
05&\4&\\050&\4&\\051&\4&\\052&\4&\\053&\4&\\054&\4&\:fundefined&\4&\:f
undefined&\4&\:fundefined&\4\cr
\noalign{\hrule}
06&\2&\\060&\2&\\061&\2&\\062&\2&\\063&\2&\\064&\2&\\065&\2&\\066&\2&\\067&\2\cr
\noalign{\hrule}
07&\2&\\070&\2&\\071&\2&\\072&\2&\\073&\2&\\074&\2&\\075&\2&\\076&\2&\!
\:fundefined&\2\cr
\noalign{\hrule}
10&\2&\\100&\2&\\101&\2&\\102&\2&\\103&\2&\:fundefined&\2&\:fundefined&\2&\\106\!
&\2&\\107&\2\cr
\noalign{\hrule}
11&\3&\\110&\3&\\111&\3&\\112&\3&\\113&\3&\\114&\3&\\115&\3&\\116&\3&\\117&\3\cr
\noalign{\hrule}
12&\1&\\120&\1&\\121&\1&\\122&\1&\\123&\1&\\124&\1&\\125&\1&\\126&\1&\\127&\1\cr
\noalign{\hrule}
13&\3&\\130&\3&\\131&\3&\\132&\3&\\133&\3&\\134&\3&\\135&\3&\\136&\3&\\137&\3\cr
\noalign{\hrule}
14&\0&\:fundefined&\0&\:fundefined&\0&\:fundefined&\0&\:fundefined&\0&\:f
undefined&\0&\:fundefined&\0&\:fundefined&\0&\:fundefined&\0\cr
\noalign{\hrule}
15&\0&\:fundefined&\0&\:fundefined&\0&\:fundefined&\0&\:fundefined&\0&\:f
undefined&\0&\:fundefined&\0&\:fundefined&\0&\:fundefined&\0\cr
\noalign{\hrule}
16&\4&\\160&\4&\\161&\4&\\162&\4&\\163&\4&\\164&\4&\\165&\4&\\166&\4&\:f
undefined&\4\cr
\noalign{\hrule}
17&\1&\\170&\1&\\171&\1&\\172&\1&\\173&\1&\\174&\1&\\175&\1&\:fundefined&\1&\:f
undefined&\1\cr}
\hrule}
\vfill
\eject
\noindent{\bf 8. \TeX\ math mode.}\xskip When \TeX\ is in math mode, it
converts 7-bit codes into 9-bit codes according to the table below. Furthermore
a ``type'' is associated with the 9-bit code, making (almost) a 12-bit code,
since there are seven types (Ord, Op, Bin, Rel, Open, Close, Punct); see
Chapter 18. This conversion is based on the SUAI code. For example, if you
type ``{\tt→}'' at Stanford (character \¬031) the table below says that this
is converted to {\:dRel \:i441}, namely a mathematical ``relation'' found
in the {\tt sy} font as character \¬041, and this is ``$→$''.

Not all of these 128 codes can appear in character files that are prepared
with ordinary software, but the chart shows what would happen if they could.
If people at MIT ever want to use \TeX\ they will undoubtedly make changes
to the internal table that \TeX\ uses for this conversion, because of the
ten discrepancies between MIT's code and the SUAI code. However, people at
CMU or USC should have no trouble, since \TeX\ uses this table only for
characters classified as $\langle$letter$\rangle$ or $\langle$otherchar$\rangle$
(see Chapter 9).

\vfill
\moveright26pt\vbox{
\def\\{\char'}
\hbox{\hbox to 40pt{\hfill0\hfill}\!
\hbox to 40pt{\hfill1\hfill}\!
\hbox to 40pt{\hfill2\hfill}\!
\hbox to 40pt{\hfill3\hfill}\!
\hbox to 40pt{\hfill4\hfill}\!
\hbox to 40pt{\hfill5\hfill}\!
\hbox to 40pt{\hfill6\hfill}\!
\hbox to 40pt{\hfill7\hfill}}
\vskip 4pt
\hrule
\def\|{\vrule height 10.5pt depth 4.5pt}
\halign{\hbox to 0pt{\hskip -24pt\¬#0\hfill}&\|
\hbox to 40pt{\hfill\:e#\hfill\|}&\!
\hbox to 40pt{\hfill\:e#\hfill\|}&\!
\hbox to 40pt{\hfill\:e#\hfill\|}&\!
\hbox to 40pt{\hfill\:e#\hfill\|}&\!
\hbox to 40pt{\hfill\:e#\hfill\|}&\!
\hbox to 40pt{\hfill\:e#\hfill\|}&\!
\hbox to 40pt{\hfill\:e#\hfill\|}&\!
\hbox to 40pt{\hfill\:e#\hfill\|}\cr
00&Bin \:i401&Rel \:i443&Ord \:i213&Ord \:i214&Bin \:i536&Ord \:i472&Ord \:i
217&Ord \:i231\cr
\noalign{\hrule}
01&Ord \:i225&Ord \:i215&Ord \:i216&Op \:i563&Bin \:i406&Bin \:i410&Ord \:i
461&Ord \:i245\cr
\noalign{\hrule}
02&Rel \:i432&Rel \:i433&Bin \:i534&Bin \:i533&Ord \:i470&Ord \:i471&Bin \:i
412&Rel \:i444\cr
\noalign{\hrule}
03&Ord \:i465&Rel \:i441&Rel \:i430&Rel \:i434&Rel \:i424&Rel \:i425&Rel \:i
421&Bin \:i537\cr
\noalign{\hrule}
04&Ord \:i463&Close \:i041&Ord \:i541&Ord \:i561&Ord \:i577&Ord \:i045&Ord \:i
046&Close \:i047\cr
\noalign{\hrule}
05&Open \:i050&Close \:i051&Ord \:i052&Bin \:i053&Punct \:i054&Bin \:i400&Ord \:i
056&Ord \:i057\cr
\noalign{\hrule}
06&Ord \:i060&Ord \:i061&Ord \:i062&Ord \:i063&Ord \:i064&Ord \:i065&Ord \:i
066&Ord \:i067\cr
\noalign{\hrule}
07&Ord \:i070&Ord \:i071&Ord \:i072&Punct \:i073&Rel \:i074&Rel \:i075&Rel \:i
076&Close \:i077\cr
\noalign{\hrule}
10&Ord \:i574&Ord \:i301&Ord \:i302&Ord \:i303&Ord \:i304&Ord \:i305&Ord \:i
306&Ord \:i307\cr
\noalign{\hrule}
11&Ord \:i310&Ord \:i311&Ord \:i312&Ord \:i313&Ord \:i314&Ord \:i315&Ord \:i
316&Ord \:i317\cr
\noalign{\hrule}
12&Ord \:i320&Ord \:i321&Ord \:i322&Ord \:i323&Ord \:i324&Ord \:i325&Ord \:i
326&Ord \:i327\cr
\noalign{\hrule}
13&Ord \:i330&Ord \:i331&Ord \:i332&Open \:i133&Bin \:i404&Close \:i135&Rel \:i
442&Rel \:i440\cr
\noalign{\hrule}
14&Open \:i140&Ord \:i341&Ord \:i342&Ord \:i343&Ord \:i344&Ord \:i345&Ord \:i
346&Ord \:i347\cr
\noalign{\hrule}
15&Ord \:i350&Ord \:i351&Ord \:i352&Ord \:i353&Ord \:i354&Ord \:i355&Ord \:i
356&Ord \:i357\cr
\noalign{\hrule}
16&Ord \:i360&Ord \:i361&Ord \:i362&Ord \:i363&Ord \:i364&Ord \:i365&Ord \:i
366&Ord \:i367\cr
\noalign{\hrule}
17&Ord \:i370&Ord \:i371&Ord \:i372&Open \:i546&Ord \:i552&Bin \:i405&Close \:i
547&Bin \:i017\cr}
\hrule}
\eject
\noindent{\bf 9. Control sequences.}\xskip The tables we have seen show all of
the special symbols that appear in \TeX's standard fonts. But the question
remains, how can a person specify them on an ordinary keyboard? Well,
you can always define your favorite control sequence in terms of the {\≡\char≡\}
operation; and if you have a suitable keyboard you can type the symbols of
SUAI code directly. \TeX\ also recognizes the control sequences listed below,
when in math mode.

\yskip {\sl(a) Lower case Greek letters:}
$$
\vcenter{\halign{\hfill$#$\hfill\quad&#\hfill\cr
\alpha&{\≡\alpha≡\}\cr
\beta&{\≡\beta≡\}\cr
\gamma&{\≡\gamma≡\}\cr
\delta&{\≡\delta≡\}\cr
\epsilon&{\≡\epsilon≡\}\cr
\zeta&{\≡\zeta≡\}\cr
\eta&{\≡\eta≡\}\cr
\theta&{\≡\theta≡\}\cr
\iota&{\≡\iota≡\}\cr}}\qquad\qquad
\vcenter{\halign{\hfill$#$\hfill\quad&#\hfill\cr
\kappa&{\≡\kappa≡\}\cr
\lambda&{\≡\lambda≡\}\cr
\mu&{\≡\mu≡\}\cr
\nu&{\≡\nu≡\}\cr
\xi&{\≡\xi≡\}\cr
\pi&{\≡\pi≡\}\cr
\rho&{\≡\rho≡\}\cr
\sigma&{\≡\sigma≡\}\cr
\tau&{\≡\tau≡\}\cr}}\qquad\qquad
\vcenter{\halign{\hfill$#$\hfill\quad&#\hfill\cr
\upsilon&{\≡\upsilon≡\}\cr
\phi&{\≡\phi≡\}\cr
\chi&{\≡\chi≡\}\cr
\psi&{\≡\psi≡\}\cr
\omega&{\≡\omega≡\}\cr
\varphi&{\≡\varphi≡\}\cr
\varpi&{\≡\varpi≡\}\cr
\vartheta&{\≡\vartheta≡\}\cr}}$$

{\sl(b) Upper case Greek letters:}$$\hbox to size{$
\vcenter{\halign{\hfill$#$\hfill\quad&#\hfill\cr
\Gamma&{\≡\Gamma≡\}\cr
\Delta&{\≡\Delta≡\}\cr
\Theta&{\≡\Theta≡\}\cr
\Lambda&{\≡\Lambda≡\}\cr
\Xi&{\≡\Xi≡\}\cr
\Pi&{\≡\Pi≡\}\cr}}\hfill
\vcenter{\halign{\hfill$#$\hfill\quad&#\hfill\cr
\Sigma&{\≡\Sigma≡\}\cr
\Upsilon&{\≡\Upsilon≡\}\cr
\Phi&{\≡\Phi≡\}\cr
\Psi&{\≡\Psi≡\}\cr
\Omega&{\≡\Omega≡\}\cr}}\hfill
\vcenter{\halign{\hfill$#$\hfill\quad&#\hfill\cr
\Gammait&{\≡\Gammait≡\}\cr
\Deltait&{\≡\Deltait≡\}\cr
\Thetait&{\≡\Thetait≡\}\cr
\Lambdait&{\≡\Lambdait≡\}\cr
\Xiit&{\≡\Xiit≡\}\cr
\Piit&{\≡\Piit≡\}\cr}}\hfill
\vcenter{\halign{\hfill$#$\hfill\quad&#\hfill\cr
\Sigmait&{\≡\Sigmait≡\}\cr
\Upsilonit&{\≡\Upsilonit≡\}\cr
\Phiit&{\≡\Phiit≡\}\cr
\Psiit&{\≡\Psiit≡\}\cr
\Omegait&{\≡\Omegait≡\}\cr}}$}$$

{\sl(c) Script letters:}$$
\vcenter{\halign{\hfill$#$\hfill\quad&#\hfill\cr
\Ascr&{\≡\Ascr≡\}\cr
\Bscr&{\≡\Bscr≡\}\cr
\Cscr&{\≡\Cscr≡\}\cr
\Dscr&{\≡\Dscr≡\}\cr
\Escr&{\≡\Escr≡\}\cr
\Fscr&{\≡\Fscr≡\}\cr
\Gscr&{\≡\Gscr≡\}\cr
\Hscr&{\≡\Hscr≡\}\cr
\Iscr&{\≡\Iscr≡\}\cr}}\qquad\qquad
\vcenter{\halign{\hfill$#$\hfill\quad&#\hfill\cr
\Jscr&{\≡\Jscr≡\}\cr
\Kscr&{\≡\Kscr≡\}\cr
\Lscr&{\≡\Lscr≡\}\cr
\Mscr&{\≡\Mscr≡\}\cr
\Nscr&{\≡\Nscr≡\}\cr
\Oscr&{\≡\Oscr≡\}\cr
\Pscr&{\≡\Pscr≡\}\cr
\Qscr&{\≡\Qscr≡\}\cr
\Rscr&{\≡\Rscr≡\}\cr}}\qquad\qquad
\vcenter{\halign{\hfill$#$\hfill\quad&#\hfill\cr
\Sscr&{\≡\Sscr≡\}\cr
\Tscr&{\≡\Tscr≡\}\cr
\Uscr&{\≡\Uscr≡\}\cr
\Vscr&{\≡\Vscr≡\}\cr
\Wscr&{\≡\Wscr≡\}\cr
\Xscr&{\≡\Xscr≡\}\cr
\Yscr&{\≡\Yscr≡\}\cr
\Zscr&{\≡\Zscr≡\}\cr
\lscr&{\≡\lscr≡\}\cr}}$$

{\sl(d) Binary operators:}$$
\vcenter{\halign{\hfill$#$\hfill\quad&#\hfill\cr
\pm&{\≡\pm≡\}\cr
\mp&{\≡\mp≡\}\cr
\times&{\≡\times≡\}\cr
\div&{\≡\div≡\}\cr
\rslash&{\≡\rslash≡\}\cr
\cdot&{\≡\cdot≡\}\cr}}\qquad\qquad
\vcenter{\halign{\hfill$#$\hfill\quad&#\hfill\cr
\oplus&{\≡\oplus≡\}\cr
\ominus&{\≡\ominus≡\}\cr
\otimes&{\≡\otimes≡\}\cr
\odiv&{\≡\odiv≡\}\cr
\odot&{\≡\odot≡\}\cr
\uplus&{\≡\uplus≡\}\cr}}\qquad\qquad
\vcenter{\halign{\hfill$#$\hfill\quad&#\hfill\cr
\ast&{\≡\ast≡\}\cr
\circ&{\≡\circ≡\}\cr
\bullet&{\≡\bullet≡\}\cr
\interc&{\≡\interc≡\}\cr
\lub&{\≡\lub≡\}\cr
\glb&{\≡\glb≡\}\cr}}$$

{\sl(e) Binary relations:}$$
\vcenter{\halign{\hfill$#$\hfill\quad&#\hfill\cr
\up&{\≡\up≡\}\cr
\down&{\≡\down≡\}\cr
\←&{\≡\←≡\}\cr
\→&{\≡\→≡\}\cr
\↑&{\≡\↑≡\}\cr
\↓&{\≡\≡↓≡\}\cr
\↔&{\≡\≡spose←→≡\}\cr
\lsh&{\≡\lsh≡\}\cr
\rsh&{\≡\rsh≡\}\cr}}\qquad\qquad
\vcenter{\halign{\hfill$#$\hfill\quad&#\hfill\cr
\perp&{\≡\perp≡\}\cr
\vdash&{\≡\vdash≡\}\cr
\dashv&{\≡\dashv≡\}\cr
\mapsto&{\≡\mapsto≡\}\cr
\relv&{\≡\relv≡\}\cr
\relvv&{\≡\relvv≡\}\cr
\subset&{\≡\subset≡\}\cr
\supset&{\≡\supset≡\}\cr
\in&{\≡\in≡\}\cr
\notin&{\≡\notin≡\}\cr}}\qquad\qquad
\vcenter{\halign{\hfill$#$\hfill\quad&#\hfill\cr
\prec&{\≡\prec≡\}\cr
\preceq&{\≡\preceq≡\}\cr
\succ&{\≡\succ≡\}\cr
\succeq&{\≡\succeq≡\}\cr
\sqsub&{\≡\sqsub≡\}\cr
\lsls&{\≡\lsls≡\}\cr
\grgr&{\≡\grgr≡\}\cr
\simeq&{\≡\simeq≡\}\cr
\approx&{\≡\approx≡\}\cr
\doteq&{\≡\doteq≡\}\cr}}$$
You can also use the control sequence {\≡\not≡\} to
negate or ``cross out'' most of the relations above. For example, the symbol
``$\not\subset$'' is really two symbols, obtained by typing ``{\≡\not\subset≡\}''.\!
\xskip(Character \¬100 in the symbol font has a width of zero, so it will overlap
the following character.)\xskip But watch out: you should actually type
``{\≡\mathrel{\not\subset}≡\}'', in order to prevent \TeX\ from breaking a
line after {\≡\not≡\}.\xskip (See the definition of {\≡\neqv≡\} in Appendix B.)

\yyskip{\sl(f) Brackets:}$$
\vcenter{\halign{\hfill$#$\hfill\quad&#\hfill\cr
\lfloor&{\≡\lfloor≡\}\cr
\lceil&{\≡\lceil≡\}\cr
\{&{\≡\{≡\}\cr
\langle&{\≡\langle≡\}\cr
\dleft&{\≡\dleft≡\}\cr
\leftv&{\≡\leftv≡\}\cr
\leftvv&{\≡\leftvv≡\}\cr}}\qquad\qquad
\vcenter{\halign{\hfill$#$\hfill\quad&#\hfill\cr
\rfloor&{\≡\rfloor≡\}\cr
\rceil&{\≡\rceil≡\}\cr
\}&{\≡\}≡\}\cr
\rangle&{\≡\rangle≡\}\cr
\dright&{\≡\dright≡\}\cr
\rightv&{\≡\rightv≡\}\cr
\rightvv&{\≡\rightvv≡\}\cr}}$$

{\sl(g) ``Large'' operators (text and display styles):}$$\baselineskip 32pt
\hbox to size{$
\vcenter{\halign{\hfill$#$\hfill\quad&\hfill$\dispstyle#$\hfill\quad&#\hfill\cr
\sum&\sum&{\≡\sum≡\}\cr
\osum&\osum&{\≡\osum≡\}\cr
\int&\int&{\≡\int≡\}\cr
\oint&\oint&{\≡\oint≡\}\cr}}\hfill
\vcenter{\baselineskip27pt
\halign{\hfill$#$\hfill\quad&\hfill$\dispstyle#$\hfill\quad&#\hfill\cr
\inter&\inter&{\≡\inter≡\}\cr
\union&\union&{\≡\union≡\}\cr
\squnion&\squnion&{\≡\squnion≡\}\cr
\meet&\meet&{\≡\meet≡\}\cr
\join&\join&{\≡\join≡\}\cr}}\hfill
\vcenter{\halign{\hfill$#$\hfill\quad&\hfill$\dispstyle#$\hfill\quad&#\hfill\cr
\prod&\prod&{\≡\prod≡\}\cr
\oprod&\oprod&{\≡\oprod≡\}\cr
\odotprod&\odotprod&{\≡\odotprod≡\}\cr
\munion&\munion&{\≡\munion≡\}\cr}}$}$$

{\sl(h) Miscellaneous math symbols:}$$
\vcenter{\halign{\hfill$#$\hfill\quad&#\hfill\cr
\iit&{\≡\iit≡\}\cr
\jit&{\≡\jit≡\}\cr
\real&{\≡\real≡\}\cr
\imag&{\≡\imag≡\}\cr
\aleph&{\≡\aleph≡\}\cr
\wp&{\≡\wp≡\}\cr}}\qquad\qquad
\vcenter{\halign{\hfill$#$\hfill\quad&#\hfill\cr
\infty&{\≡\infty≡\}\cr
\emptyset&{\≡\emptyset≡\}\cr
\#&{\≡\#≡\}\cr
\|&{\≡\|≡\}\cr
\angle&{\≡\angle≡\}\cr
\prime&{\≡\prime≡\}\cr}}\qquad\qquad
\vcenter{\halign{\hfill$#$\hfill\quad&#\hfill\cr
\partial&{\≡\partial≡\}\cr
\nabla&{\≡\nabla≡\}\cr
\smallint&{\≡\smallint≡\}\cr
\radical&{\≡\radical≡\}\cr
\top&{\≡\top≡\}\cr
\bot&{\≡\bot≡\}\cr}}$$

\yskip {\sl(i) Miscellaneous nonmath symbols (but allowed only in math mode):}$$
\vcenter{\halign{\hfill$#$\hfill\quad&#\hfill\cr
\section&{\≡\section≡\}\cr
\dag&{\≡\dag≡\}\cr
\ddag&{\≡\ddag≡\}\cr
\P&{\≡\P≡\}\cr}}\qquad\qquad
\vcenter{\halign{\hfill$#$\hfill\quad&#\hfill\cr
\@&{\≡\@≡\}\cr
\copyright&{\≡\copyright≡\}\cr
\sterling&{\≡\sterling≡\}\cr
\$&{\≡\$≡\}\cr}}$$

Some of the symbols in \TeX's math fonts can be accessed directly only by using the
SUAI-oriented conversions in subsection 8. For example, the only way to get a left
arrow is by typing ``{\≡$←$≡\}''; no built-in control sequence
has been defined for it. If your keyboard doesn't have this symbol,
the remedy is to define an appropriate new control sequence, such as
$$\hbox{\≡\def\from{\mathrel{\char≡'440}}≡\}\quad.$$