.TH "MANDOC_CHAR" "7" "February 5, 2017" "Debian" "Miscellaneous Information Manual"
.nh
.if n .ad l
.SH "NAME"
\fBmandoc_char\fR
\- mandoc special characters
.SH "DESCRIPTION"
This page documents the
roff(7)
escape sequences accepted by
mandoc(1)
to represent special characters in
mdoc(7)
and
man(7)
documents.
.PP
The rendering depends on the
mandoc(1)
output mode; in ASCII output, most characters are completely
unintelligible.
For that reason, using any of the special characters documented here,
except those discussed in the
\fIDESCRIPTION\fR,
is strongly discouraged; they are supported merely for backwards
compatibility with existing documents.
.PP
In particular, in English manual pages, do not use special-character
escape sequences to represent national language characters in author
names; instead, provide ASCII transcriptions of the names.
.SS "Dashes and Hyphens"
In typography there are different types of dashes of various width:
the hyphen (-),
the minus sign (\(mi),
the en-dash (\(en),
and the em-dash (\(em).
.PP
Hyphens are used for adjectives;
to separate the two parts of a compound word;
or to separate a word across two successive lines of text.
The hyphen does not need to be escaped:
.nf
.sp
.RS 6n
blue-eyed
lorry-driver
.RE
.fi
.PP
If a word on a text input line contains a hyphen, a formatter may decide
to insert an output line break after the hyphen if that helps filling
the current output line, but the whole word would overflow the line.
If it is important that the word is not broken across lines in this
way, a zero-width space
(\(oq\e&\(cq)
can be inserted before or after the hyphen.
While
mandoc(1)
never breaks the output line after hyphens adjacent to a zero-width
space, after any of the other dash- or hyphen-like characters
represented by escape sequences, or after hyphens inside words in
macro arguments, other software may not respect these rules and may
break the line even in such cases.
.PP
Some
roff(7)
implementations contains dictionaries allowing to break the line
at syllable boundaries even inside words that contain no hyphens.
Such automatic hyphenation is not supported by
mandoc(1),
which only breaks the line at whitespace, and inside words only
after existing hyphens.
.PP
The mathematical minus sign is used for negative numbers or subtraction.
It should be written as
\(oq\e(mi\(cq:
.nf
.sp
.RS 6n
a = 3 \e(mi 1;
b = \e(mi2;
.RE
.fi
.PP
The en-dash is used to separate the two elements of a range,
or can be used the same way as an em-dash.
It should be written as
\(oq\e(en\(cq:
.nf
.sp
.RS 6n
pp. 95\e(en97.
Go away \e(en or else!
.RE
.fi
.PP
The em-dash can be used to show an interruption
or can be used the same way as colons, semi-colons, or parentheses.
It should be written as
\(oq\e(em\(cq:
.nf
.sp
.RS 6n
Three things \e(em apples, oranges, and bananas.
This is not that \e(em rather, this is that.
.RE
.fi
.PP
Note:
hyphens, minus signs, and en-dashes look identical under normal ASCII output.
Other formats, such as PostScript, render them correctly,
with differing widths.
.SS "Spaces"
To separate words in normal text, for indenting and alignment
in literal context, and when none of the following special cases apply,
just use the normal space character
(\(oq\ \(cq).
.PP
When filling text, output lines may be broken between words, i.e. at space
characters.
To prevent a line break between two particular words,
use the unpaddable non-breaking space escape sequence
(\(oq\e\ \&\(cq)
instead of the normal space character.
For example, the input string
\(Lqnumber\e\ 1\(Rq
will be kept together as
\(Lqnumber\ 1\(Rq
on the same output line.
.PP
On request and macro lines, the normal space character serves as an
argument delimiter.
To include whitespace into arguments, quoting is usually the best choice;
see the MACRO SYNTAX section in
roff(7).
In some cases, using the non-breaking space escape sequence
(\(oq\e\ \&\(cq)
may be preferable.
.PP
To escape macro names and to protect whitespace at the end
of input lines, the zero-width space
(\(oq\e&\(cq)
is often useful.
For example, in
mdoc(7),
a normal space character can be displayed in single quotes in either
of the following ways:
.PP
.RS 6n
\&.Sq \(dq \(dq
.RE
.RS 6n
\&.Sq \e \e&
.RE
.SS "Quotes"
On request and macro lines, the double-quote character
(\(oq\(dq\(cq)
is handled specially to allow quoting.
One way to prevent this special handling is by using the
\(oq\e(dq\(cq
escape sequence.
.PP
Note that on text lines, literal double-quote characters can be used
verbatim.
All other quote-like characters can be used verbatim as well,
even on request and macro lines.
.SS "Accents"
In output modes supporting such special output characters, for example
\fB\-T\fR \fBpdf\fR,
some
roff(7)
formatters convert the following ASCII input characters to the
following Unicode special output characters:
.RS 6n
.TS
l l.
.PP
\(ga	U+2018	left single quotation mark
.PP
\(aq	U+2019	right single quotation mark
.PP
\(ti	U+02DC	small tilde
.TE
.RE
.PP
In prose, this automatic substitution is often desirable;
but when these characters have to be displayed as plain ASCII
characters, for example in source code samples, they require
escaping to render as follows:
.RS 6n
.TS
l l.
.PP
\e(ga	U+0060	grave accent
.PP
\e(aq	U+0027	apostrophe
.PP
\e(ti	U+007E	tilde
.TE
.RE
.SS "Periods"
The period
(\(oq\&.\(cq)
is handled specially at the beginning of an input line,
where it introduces a
roff(7)
request or a macro, and when appearing alone as a macro argument in
mdoc(7).
In such situations, prepend a zero-width space
(\(oq\e&.\(cq)
to make it behave like normal text.
.PP
Do not use the
\(oq\e.\(cq
escape sequence.
It does not prevent special handling of the period.
.SS "Backslashes"
To include a literal backslash
(\(oq\e\(cq)
into the output, use the
(\(oq\ee\(cq)
escape sequence.
.PP
Note that doubling it
(\(oq\e\e\(cq)
is not the right way to output a backslash.
Because
mandoc(1)
does not implement full
roff(7)
functionality, it may work with
mandoc(1),
but it may have weird effects on complete
roff(7)
implementations.
.SH "SPECIAL CHARACTERS"
Special characters are encoded as
\(oq\eX\(cq
(for a one-character escape),
\(oq\e(XX\(cq
(two-character),
and
\(oq\e[N]\(cq
(N-character).
For details, see the
\fISpecial Characters\fR
subsection of the
roff(7)
manual.
.PP
Spacing:
.RS 6n
.TS
l l.
.PD 0
.PP
\fIInput\fR	\fIDescription\fR
.PP
\(oq\e\ \&\(cq	unpaddable non-breaking space
.PP
\e\(ti	paddable non-breaking space
.PP
\e0	unpaddable, breaking digit-width space
.PP
\e|	one-sixth \e(em narrow space, zero width in nroff mode
.PP
\e^	one-twelfth \e(em half-narrow space, zero width in nroff
.PP
\e&	zero-width space
.PP
\e%	zero-width space allowing hyphenation
.TE
.RE
.PD
.PP
Lines:
.RS 6n
.TS
l l l.
.PD 0
.PP
\fIInput\fR	\fIRendered\fR	\fIDescription\fR
.PP
\e(ba	\(ba	bar
.PP
\e(br	\(br	box rule
.PP
\e(ul	\(ul	underscore
.PP
\e(rn	\(rn	overline
.PP
\e(bb	\(bb	broken bar
.PP
\e(sl	\(sl	forward slash
.PP
\e(rs	\(rs	backward slash
.TE
.RE
.PD
.PP
Text markers:
.RS 6n
.TS
l l l.
.PD 0
.PP
\fIInput\fR	\fIRendered\fR	\fIDescription\fR
.PP
\e(ci	\(ci	circle
.PP
\e(bu	\(bu	bullet
.PP
\e(dd	\(dd	double dagger
.PP
\e(dg	\(dg	dagger
.PP
\e(lz	\(lz	lozenge
.PP
\e(sq	\(sq	white square
.PP
\e(ps	\(ps	paragraph
.PP
\e(sc	\(sc	section
.PP
\e(lh	\(lh	left hand
.PP
\e(rh	\(rh	right hand
.PP
\e(at	\(at	at
.PP
\e(sh	\(sh	hash (pound)
.PP
\e(CR	\(CR	carriage return
.PP
\e(OK	\(OK	check mark
.TE
.RE
.PD
.PP
Legal symbols:
.RS 6n
.TS
l l l.
.PD 0
.PP
\fIInput\fR	\fIRendered\fR	\fIDescription\fR
.PP
\e(co	\(co	copyright
.PP
\e(rg	\(rg	registered
.PP
\e(tm	\(tm	trademarked
.TE
.RE
.PD
.PP
Punctuation:
.RS 6n
.TS
l l l.
.PD 0
.PP
\fIInput\fR	\fIRendered\fR	\fIDescription\fR
.PP
\e(em	\(em	em-dash
.PP
\e(en	\(en	en-dash
.PP
\e(hy	\(hy	hyphen
.PP
\ee	\e	back-slash
.PP
\e.	\.	period
.PP
\e(r!	\(r!	upside-down exclamation
.PP
\e(r?	\(r?	upside-down question
.TE
.RE
.PD
.PP
Quotes:
.RS 6n
.TS
l l l.
.PD 0
.PP
\fIInput\fR	\fIRendered\fR	\fIDescription\fR
.PP
\e(Bq	\(Bq	right low double-quote
.PP
\e(bq	\(bq	right low single-quote
.PP
\e(lq	\(lq	left double-quote
.PP
\e(rq	\(rq	right double-quote
.PP
\e(oq	\(oq	left single-quote
.PP
\e(cq	\(cq	right single-quote
.PP
\e(aq	\(aq	apostrophe quote (text)
.PP
\e(dq	\(dq	double quote (text)
.PP
\e(Fo	\(Fo	left guillemet
.PP
\e(Fc	\(Fc	right guillemet
.PP
\e(fo	\(fo	left single guillemet
.PP
\e(fc	\(fc	right single guillemet
.TE
.RE
.PD
.PP
Brackets:
.RS 6n
.TS
l l l.
.PD 0
.PP
\fIInput\fR	\fIRendered\fR	\fIDescription\fR
.PP
\e(lB	\(lB	left bracket
.PP
\e(rB	\(rB	right bracket
.PP
\e(lC	\(lC	left brace
.PP
\e(rC	\(rC	right brace
.PP
\e(la	\(la	left angle
.PP
\e(ra	\(ra	right angle
.PP
\e(bv	\(bv	brace extension
.PP
\e[braceex]	\[braceex]	brace extension
.PP
\e[bracketlefttp]	\[bracketlefttp]	top-left hooked bracket
.PP
\e[bracketleftbt]	\[bracketleftbt]	bottom-left hooked bracket
.PP
\e[bracketleftex]	\[bracketleftex]	left hooked bracket extension
.PP
\e[bracketrighttp]	\[bracketrighttp]	top-right hooked bracket
.PP
\e[bracketrightbt]	\[bracketrightbt]	bottom-right hooked bracket
.PP
\e[bracketrightex]	\[bracketrightex]	right hooked bracket extension
.PP
\e(lt	\(lt	top-left hooked brace
.PP
\e[bracelefttp]	\[bracelefttp]	top-left hooked brace
.PP
\e(lk	\(lk	mid-left hooked brace
.PP
\e[braceleftmid]	\[braceleftmid]	mid-left hooked brace
.PP
\e(lb	\(lb	bottom-left hooked brace
.PP
\e[braceleftbt]	\[braceleftbt]	bottom-left hooked brace
.PP
\e[braceleftex]	\[braceleftex]	left hooked brace extension
.PP
\e(rt	\(rt	top-left hooked brace
.PP
\e[bracerighttp]	\[bracerighttp]	top-right hooked brace
.PP
\e(rk	\(rk	mid-right hooked brace
.PP
\e[bracerightmid]	\[bracerightmid]	mid-right hooked brace
.PP
\e(rb	\(rb	bottom-right hooked brace
.PP
\e[bracerightbt]	\[bracerightbt]	bottom-right hooked brace
.PP
\e[bracerightex]	\[bracerightex]	right hooked brace extension
.PP
\e[parenlefttp]	\[parenlefttp]	top-left hooked parenthesis
.PP
\e[parenleftbt]	\[parenleftbt]	bottom-left hooked parenthesis
.PP
\e[parenleftex]	\[parenleftex]	left hooked parenthesis extension
.PP
\e[parenrighttp]	\[parenrighttp]	top-right hooked parenthesis
.PP
\e[parenrightbt]	\[parenrightbt]	bottom-right hooked parenthesis
.PP
\e[parenrightex]	\[parenrightex]	right hooked parenthesis extension
.TE
.RE
.PD
.PP
Arrows:
.RS 6n
.TS
l l l.
.PD 0
.PP
\fIInput\fR	\fIRendered\fR	\fIDescription\fR
.PP
\e(<-	\(<-	left arrow
.PP
\e(->	\(->	right arrow
.PP
\e(<>	\(<>	left-right arrow
.PP
\e(da	\(da	down arrow
.PP
\e(ua	\(ua	up arrow
.PP
\e(va	\(va	up-down arrow
.PP
\e(lA	\(lA	left double-arrow
.PP
\e(rA	\(rA	right double-arrow
.PP
\e(hA	\(hA	left-right double-arrow
.PP
\e(uA	\(uA	up double-arrow
.PP
\e(dA	\(dA	down double-arrow
.PP
\e(vA	\(vA	up-down double-arrow
.TE
.RE
.PD
.PP
Logical:
.RS 6n
.TS
l l l.
.PD 0
.PP
\fIInput\fR	\fIRendered\fR	\fIDescription\fR
.PP
\e(AN	\(AN	logical and
.PP
\e(OR	\(OR	logical or
.PP
\e(no	\(no	logical not
.PP
\e[tno]	\[tno]	logical not (text)
.PP
\e(te	\(te	existential quantifier
.PP
\e(fa	\(fa	universal quantifier
.PP
\e(st	\(st	such that
.PP
\e(tf	\(tf	therefore
.PP
\e(3d	\(3d	therefore
.PP
\e(or	\(or	bitwise or
.TE
.RE
.PD
.PP
Mathematical:
.RS 6n
.TS
l l l.
.PD 0
.PP
\fIInput\fR	\fIRendered\fR	\fIDescription\fR
.PP
\e(pl	\(pl	plus
.PP
\e(mi	\(mi	minus
.PP
\e-	\-	minus (text)
.PP
\e(-+	\(-+	minus-plus
.PP
\e(+-	\(+-	plus-minus
.PP
\e[t+-]	\[t+-]	plus-minus (text)
.PP
\e(pc	\(pc	center-dot
.PP
\e(mu	\(mu	multiply
.PP
\e[tmu]	\[tmu]	multiply (text)
.PP
\e(c*	\(c*	circle-multiply
.PP
\e(c+	\(c+	circle-plus
.PP
\e(di	\(di	divide
.PP
\e[tdi]	\[tdi]	divide (text)
.PP
\e(f/	\(f/	fraction
.PP
\e(**	\(**	asterisk
.PP
\e(<=	\(<=	less-than-equal
.PP
\e(>=	\(>=	greater-than-equal
.PP
\e(<<	\(<<	much less
.PP
\e(>>	\(>>	much greater
.PP
\e(eq	\(eq	equal
.PP
\e(!=	\(!=	not equal
.PP
\e(==	\(==	equivalent
.PP
\e(ne	\(ne	not equivalent
.PP
\e(ap	\(ap	tilde operator
.PP
\e(|=	\(|=	asymptotically equal
.PP
\e(=\(ti	\(=~	approximately equal
.PP
\e(\(ti\(ti	\(~~	almost equal
.PP
\e(\(ti=	\(~=	almost equal
.PP
\e(pt	\(pt	proportionate
.PP
\e(es	\(es	empty set
.PP
\e(mo	\(mo	element
.PP
\e(nm	\(nm	not element
.PP
\e(sb	\(sb	proper subset
.PP
\e(nb	\(nb	not subset
.PP
\e(sp	\(sp	proper superset
.PP
\e(nc	\(nc	not superset
.PP
\e(ib	\(ib	reflexive subset
.PP
\e(ip	\(ip	reflexive superset
.PP
\e(ca	\(ca	intersection
.PP
\e(cu	\(cu	union
.PP
\e(/_	\(/_	angle
.PP
\e(pp	\(pp	perpendicular
.PP
\e(is	\(is	integral
.PP
\e[integral]	\[integral]	integral
.PP
\e[sum]	\[sum]	summation
.PP
\e[product]	\[product]	product
.PP
\e[coproduct]	\[coproduct]	coproduct
.PP
\e(gr	\(gr	gradient
.PP
\e(sr	\(sr	square root
.PP
\e[sqrt]	\[sqrt]	square root
.PP
\e(lc	\(lc	left-ceiling
.PP
\e(rc	\(rc	right-ceiling
.PP
\e(lf	\(lf	left-floor
.PP
\e(rf	\(rf	right-floor
.PP
\e(if	\(if	infinity
.PP
\e(Ah	\(Ah	aleph
.PP
\e(Im	\(Im	imaginary
.PP
\e(Re	\(Re	real
.PP
\e(pd	\(pd	partial differential
.PP
\e(-h	\(-h	Planck constant over 2\(*p
.PP
\e[12]	\[12]	one-half
.PP
\e[14]	\[14]	one-fourth
.PP
\e[34]	\[34]	three-fourths
.TE
.RE
.PD
.PP
Ligatures:
.RS 6n
.TS
l l l.
.PD 0
.PP
\fIInput\fR	\fIRendered\fR	\fIDescription\fR
.PP
\e(ff	\(ff	ff ligature
.PP
\e(fi	\(fi	fi ligature
.PP
\e(fl	\(fl	fl ligature
.PP
\e(Fi	\(Fi	ffi ligature
.PP
\e(Fl	\(Fl	ffl ligature
.PP
\e(AE	\(AE	AE
.PP
\e(ae	\(ae	ae
.PP
\e(OE	\(OE	OE
.PP
\e(oe	\(oe	oe
.PP
\e(ss	\(ss	German eszett
.PP
\e(IJ	\(IJ	IJ ligature
.PP
\e(ij	\(ij	ij ligature
.TE
.RE
.PD
.PP
Accents:
.RS 6n
.TS
l l l.
.PD 0
.PP
\fIInput\fR	\fIRendered\fR	\fIDescription\fR
.PP
\e(a"	\(a"	Hungarian umlaut
.PP
\e(a-	\(a-	macron
.PP
\e(a.	\(a.	dotted
.PP
\e(a^	\(a^	circumflex
.PP
\e(aa	\(aa	acute
.PP
\e\(aq	\'	acute
.PP
\e(ga	\(ga	grave
.PP
\e\(ga	\`	grave
.PP
\e(ab	\(ab	breve
.PP
\e(ac	\(ac	cedilla
.PP
\e(ad	\(ad	dieresis
.PP
\e(ah	\(ah	caron
.PP
\e(ao	\(ao	ring
.PP
\e(a\(ti	\(a~	tilde
.PP
\e(ho	\(ho	ogonek
.PP
\e(ha	\(ha	hat (text)
.PP
\e(ti	\(ti	tilde (text)
.TE
.RE
.PD
.PP
Accented letters:
.RS 6n
.TS
l l l.
.PD 0
.PP
\fIInput\fR	\fIRendered\fR	\fIDescription\fR
.PP
\e(\(aqA	\('A	acute A
.PP
\e(\(aqE	\('E	acute E
.PP
\e(\(aqI	\('I	acute I
.PP
\e(\(aqO	\('O	acute O
.PP
\e(\(aqU	\('U	acute U
.PP
\e(\(aqa	\('a	acute a
.PP
\e(\(aqe	\('e	acute e
.PP
\e(\(aqi	\('i	acute i
.PP
\e(\(aqo	\('o	acute o
.PP
\e(\(aqu	\('u	acute u
.PP
\e(\(gaA	\(`A	grave A
.PP
\e(\(gaE	\(`E	grave E
.PP
\e(\(gaI	\(`I	grave I
.PP
\e(\(gaO	\(`O	grave O
.PP
\e(\(gaU	\(`U	grave U
.PP
\e(\(gaa	\(`a	grave a
.PP
\e(\(gae	\(`e	grave e
.PP
\e(\(gai	\(`i	grave i
.PP
\e(\(gao	\(`i	grave o
.PP
\e(\(gau	\(`u	grave u
.PP
\e(\(tiA	\(~A	tilde A
.PP
\e(\(tiN	\(~N	tilde N
.PP
\e(\(tiO	\(~O	tilde O
.PP
\e(\(tia	\(~a	tilde a
.PP
\e(\(tin	\(~n	tilde n
.PP
\e(\(tio	\(~o	tilde o
.PP
\e(:A	\(:A	dieresis A
.PP
\e(:E	\(:E	dieresis E
.PP
\e(:I	\(:I	dieresis I
.PP
\e(:O	\(:O	dieresis O
.PP
\e(:U	\(:U	dieresis U
.PP
\e(:a	\(:a	dieresis a
.PP
\e(:e	\(:e	dieresis e
.PP
\e(:i	\(:i	dieresis i
.PP
\e(:o	\(:o	dieresis o
.PP
\e(:u	\(:u	dieresis u
.PP
\e(:y	\(:y	dieresis y
.PP
\e(^A	\(^A	circumflex A
.PP
\e(^E	\(^E	circumflex E
.PP
\e(^I	\(^I	circumflex I
.PP
\e(^O	\(^O	circumflex O
.PP
\e(^U	\(^U	circumflex U
.PP
\e(^a	\(^a	circumflex a
.PP
\e(^e	\(^e	circumflex e
.PP
\e(^i	\(^i	circumflex i
.PP
\e(^o	\(^o	circumflex o
.PP
\e(^u	\(^u	circumflex u
.PP
\e(,C	\(,C	cedilla C
.PP
\e(,c	\(,c	cedilla c
.PP
\e(/L	\(/L	stroke L
.PP
\e(/l	\(/l	stroke l
.PP
\e(/O	\(/O	stroke O
.PP
\e(/o	\(/o	stroke o
.PP
\e(oA	\(oA	ring A
.PP
\e(oa	\(oa	ring a
.TE
.RE
.PD
.PP
Special letters:
.RS 6n
.TS
l l l.
.PD 0
.PP
\fIInput\fR	\fIRendered\fR	\fIDescription\fR
.PP
\e(-D	\(-D	Eth
.PP
\e(Sd	\(Sd	eth
.PP
\e(TP	\(TP	Thorn
.PP
\e(Tp	\(Tp	thorn
.PP
\e(.i	\(.i	dotless i
.PP
\e(.j	\(.j	dotless j
.TE
.RE
.PD
.PP
Currency:
.RS 6n
.TS
l l l.
.PD 0
.PP
\fIInput\fR	\fIRendered\fR	\fIDescription\fR
.PP
\e(Do	\(Do	dollar
.PP
\e(ct	\(ct	cent
.PP
\e(Eu	\(Eu	Euro symbol
.PP
\e(eu	\(eu	Euro symbol
.PP
\e(Ye	\(Ye	yen
.PP
\e(Po	\(Po	pound
.PP
\e(Cs	\(Cs	Scandinavian
.PP
\e(Fn	\(Fn	florin
.TE
.RE
.PD
.PP
Units:
.RS 6n
.TS
l l l.
.PD 0
.PP
\fIInput\fR	\fIRendered\fR	\fIDescription\fR
.PP
\e(de	\(de	degree
.PP
\e(%0	\(%0	per-thousand
.PP
\e(fm	\(fm	minute
.PP
\e(sd	\(sd	second
.PP
\e(mc	\(mc	micro
.TE
.RE
.PD
.PP
Greek letters:
.RS 6n
.TS
l l l.
.PD 0
.PP
\fIInput\fR	\fIRendered\fR	\fIDescription\fR
.PP
\e(*A	\(*A	Alpha
.PP
\e(*B	\(*B	Beta
.PP
\e(*G	\(*G	Gamma
.PP
\e(*D	\(*D	Delta
.PP
\e(*E	\(*E	Epsilon
.PP
\e(*Z	\(*Z	Zeta
.PP
\e(*Y	\(*Y	Eta
.PP
\e(*H	\(*H	Theta
.PP
\e(*I	\(*I	Iota
.PP
\e(*K	\(*K	Kappa
.PP
\e(*L	\(*L	Lambda
.PP
\e(*M	\(*M	Mu
.PP
\e(*N	\(*N	Nu
.PP
\e(*C	\(*C	Xi
.PP
\e(*O	\(*O	Omicron
.PP
\e(*P	\(*P	Pi
.PP
\e(*R	\(*R	Rho
.PP
\e(*S	\(*S	Sigma
.PP
\e(*T	\(*T	Tau
.PP
\e(*U	\(*U	Upsilon
.PP
\e(*F	\(*F	Phi
.PP
\e(*X	\(*X	Chi
.PP
\e(*Q	\(*Q	Psi
.PP
\e(*W	\(*W	Omega
.PP
\e(*a	\(*a	alpha
.PP
\e(*b	\(*b	beta
.PP
\e(*g	\(*g	gamma
.PP
\e(*d	\(*d	delta
.PP
\e(*e	\(*e	epsilon
.PP
\e(*z	\(*z	zeta
.PP
\e(*y	\(*y	eta
.PP
\e(*h	\(*h	theta
.PP
\e(*i	\(*i	iota
.PP
\e(*k	\(*k	kappa
.PP
\e(*l	\(*l	lambda
.PP
\e(*m	\(*m	mu
.PP
\e(*n	\(*n	nu
.PP
\e(*c	\(*c	xi
.PP
\e(*o	\(*o	omicron
.PP
\e(*p	\(*p	pi
.PP
\e(*r	\(*r	rho
.PP
\e(*s	\(*s	sigma
.PP
\e(*t	\(*t	tau
.PP
\e(*u	\(*u	upsilon
.PP
\e(*f	\(*f	phi
.PP
\e(*x	\(*x	chi
.PP
\e(*q	\(*q	psi
.PP
\e(*w	\(*w	omega
.PP
\e(+h	\(+h	theta variant
.PP
\e(+f	\(+f	phi variant
.PP
\e(+p	\(+p	pi variant
.PP
\e(+e	\(+e	epsilon variant
.PP
\e(ts	\(ts	sigma terminal
.TE
.RE
.PD
.SH "PREDEFINED STRINGS"
Predefined strings are inherited from the macro packages of historical
troff implementations.
They are
\fInot recommended\fR
for use, as they differ across implementations.
Manuals using these predefined strings are almost certainly not
portable.
.PP
Their syntax is similar to special characters, using
\(oq\e*X\(cq
(for a one-character escape),
\(oq\e*(XX\(cq
(two-character),
and
\(oq\e*[N]\(cq
(N-character).
For details, see the
\fIPredefined Strings\fR
subsection of the
roff(7)
manual.
.RS 6n
.TS
l l l.
.PP
\fIInput\fR	\fIRendered\fR	\fIDescription\fR
.PP
\e*(Ba	\fR|\fP	vertical bar
.PP
\e*(Ne	\(!=	not equal
.PP
\e*(Ge	\(>=	greater-than-equal
.PP
\e*(Le	\(<=	less-than-equal
.PP
\e*(Gt	>	greater-than
.PP
\e*(Lt	<	less-than
.PP
\e*(Pm	\(+-	plus-minus
.PP
\e*(If	infinity	infinity
.PP
\e*(Pi	pi	pi
.PP
\e*(Na	NaN	NaN
.PP
\e*(Am	&	ampersand
.PP
\e*R	\(rg	restricted mark
.PP
\e*(Tm	(Tm)	trade mark
.PP
\e*q	\(dq	double-quote
.PP
\e*(Rq	\(rq	right-double-quote
.PP
\e*(Lq	\(lq	left-double-quote
.PP
\e*(lp	(	right-parenthesis
.PP
\e*(rp	)	left-parenthesis
.PP
\e*(lq	\(lq	left double-quote
.PP
\e*(rq	\(rq	right double-quote
.PP
\e*(ua	\(ua	up arrow
.PP
\e*(va	\(va	up-down arrow
.PP
\e*(<=	\(<=	less-than-equal
.PP
\e*(>=	\(>=	greater-than-equal
.PP
\e*(aa	\(aa	acute
.PP
\e*(ga	\(ga	grave
.PP
\e*(Px	POSIX	POSIX standard name
.PP
\e*(Ai	ANSI	ANSI standard name
.TE
.RE
.SH "UNICODE CHARACTERS"
The escape sequences
.PP
.RS 6n
\e[uXXXX] and \eC\(aquXXXX\(aq
.RE
.PP
are interpreted as Unicode codepoints.
The codepoint must be in the range above U+0080 and less than U+10FFFF.
For compatibility, the hexadecimal digits
\(oqA\(cq
to
\(oqF\(cq
must be given as uppercase characters,
and points must be zero-padded to four characters; if
greater than four characters, no zero padding is allowed.
Unicode surrogates are not allowed.
.SH "NUMBERED CHARACTERS"
For backward compatibility with existing manuals,
mandoc(1)
also supports the
.PP
.RS 6n
\eN\(aq\fInumber\fR\(aq
.RE
.PP
escape sequence, inserting the character
\fInumber\fR
from the current character set into the output.
Of course, this is inherently non-portable and is already marked
as deprecated in the Heirloom roff manual.
For example, do not use \eN\(aq34\(aq, use \e(dq, or even the plain
\(oq\(dq\(cq
character where possible.
.SH "COMPATIBILITY"
This section documents compatibility between mandoc and other
troff implementations, at this time limited to GNU troff
("groff").
.TP 4n
\fB-\fR
The \eN\(aq\(aq escape sequence is limited to printable characters; in
groff, it accepts arbitrary character numbers.
.PD 0
.TP 4n
\fB-\fR
In
\fB\-T\fR\fBascii\fR,
the
\e(ss, \e(nm, \e(nb, \e(nc, \e(ib, \e(ip, \e(pp, \e[sum], \e[product],
\e[coproduct], \e(gr, \e(-h, and \e(a. special characters render
differently between mandoc and groff.
.TP 4n
\fB-\fR
In
\fB\-T\fR\fBhtml\fR
and
\fB\-T\fR\fBxhtml\fR,
the \e(\(ti=, \e(nb, and \e(nc special characters render differently
between mandoc and groff.
.TP 4n
\fB-\fR
The
\fB\-T\fR\fBps\fR
and
\fB\-T\fR\fBpdf\fR
modes format like
\fB\-T\fR\fBascii\fR
instead of rendering glyphs as in groff.
.TP 4n
\fB-\fR
The \e[radicalex], \e[sqrtex], and \e(ru special characters have been omitted
from mandoc either because they are poorly documented or they have no
known representation.
.PD
.SH "SEE ALSO"
mandoc(1),
man(7),
mdoc(7),
roff(7)
.SH "AUTHORS"
The
\fBmandoc_char\fR
manual page was written by
Kristaps Dzonsons <\fIkristaps@bsd.lv\fR>.
.SH "CAVEATS"
The predefined string
\(oq\e*(Ba\(cq
mimics the behaviour of the
\(oq\&|\(cq
character in
mdoc(7);
thus, if you wish to render a vertical bar with no side effects, use
the
\(oq\e(ba\(cq
escape.