MANDOC_CHAR(7) Standards, Environments, and Macros MANDOC_CHAR(7)


mandoc_char - mandoc special characters


This page documents the mandoc_roff(7) escape sequences accepted by
mandoc(1) to represent special characters in mdoc(7) and man(7) documents.

The rendering depends on the mandoc(1) output mode; it can be inspected by
calling man(1) on the mandoc_char manual page with different -T arguments.
In ASCII output, the rendering of some characters may be hard to interpret
for the reader. Many are rendered as descriptive strings like
"<integral>", "<degree>", or "<Gamma>", which may look ugly, and many are
replaced by similar ASCII characters. In particular, accented characters
are usually shown without the accent. For that reason, try to avoid using
any of the special characters documented here except those discussed in the
DESCRIPTION, unless they are essential for explaining the subject matter at
hand, for example when documenting complicated mathematical functions.

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.

Dashes and Hyphens

In typography there are different types of dashes of various width: the
hyphen (-), the en-dash (-), the em-dash (--), and the mathematical minus
sign (-).

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:


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 `\(en':

pp. 95\(en97.
Go away \(en or else!

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 `\(em':

Three things \(em apples, oranges, and bananas.
This is not that \(em rather, this is that.

In mandoc_roff(7) documents, the minus sign is normally written as `\-'.
In manual pages, some style guides recommend to also use `\-' if an ASCII
0x2d "hyphen-minus" output glyph that can be copied and pasted is desired
in output modes supporting it, for example in -T utf8 and -T html. But
currently, no practically relevant manual page formatter requires that
subtlety, so in manual pages, it is sufficient to write plain `-' to
represent hyphen, minus, and hyphen-minus.

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 (`\&') 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.

Some mandoc_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.


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 (` ').

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 (`\ ') instead of the normal
space character. For example, the input string "number\ 1" will be kept
together as "number 1" on the same output line.

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 mandoc_roff(7).
In some cases, using the non-breaking space escape sequence (`\ ') may be

To escape macro names and to protect whitespace at the end of input lines,
the zero-width space (`\&') is often useful. For example, in mdoc(7), a
normal space character can be displayed in single quotes in either of the
following ways:

.Sq " "
.Sq \ \&


On request and macro lines, the double-quote character (`"') is handled
specially to allow quoting. One way to prevent this special handling is by
using the `\(dq' escape sequence.

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.


In output modes supporting such special output characters, for example -T
pdf, and sometimes less consistently in -T utf8, some mandoc_roff(7)
formatters convert the following ASCII input characters to the following
Unicode special output characters:

` U+2018 left single quotation mark
' U+2019 right single quotation mark
~ U+02DC small tilde
^ U+02C6 modifier letter circumflex

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:

\(ga U+0060 grave accent
\(aq U+0027 apostrophe
\(ti U+007E tilde
\(ha U+005E circumflex accent


The period (`.') is handled specially at the beginning of an input line,
where it introduces a mandoc_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 (`\&.') to make it behave like normal text.

Do not use the `\.' escape sequence. It does not prevent special handling
of the period.


To include a literal backslash (`\') into the output, use the (`\e') escape

Note that doubling it (`\\') is not the right way to output a backslash.
Because mandoc(1) does not implement full mandoc_roff(7) functionality, it
may work with mandoc(1), but it may have weird effects on complete
mandoc_roff(7) implementations.


Special characters are encoded as `\X' (for a one-character escape), `\(XX'
(two-character), and `\[N]' (N-character). For details, see the Special
Characters subsection of the mandoc_roff(7) manual.

Spaces, non-breaking unless stated otherwise:
Input Description
`\ ' unpaddable space
\~ paddable space
\0 digit-width space
\| one-sixth \(em narrow space, zero width in nroff mode
\^ one-twelfth \(em half-narrow space, zero width in nroff
\& zero-width space
\) zero-width space transparent to end-of-sentence detection
\% zero-width space allowing hyphenation
\: zero-width space allowing line break

Input Rendered Description
\(ba | bar
\(br | box rule
\(ul _ underscore
\(ru _ underscore (width 0.5m)
\(rn - overline
\(bb | broken bar
\(sl / forward slash
\(rs \ backward slash

Text markers:
Input Rendered Description
\(ci O circle
\(bu +o bullet
\(dd <**> double dagger
\(dg <*> dagger
\(lz <> lozenge
\(sq [] white square
\(ps <paragraph> paragraph
\(sc <section> section
\(lh <= left hand
\(rh => right hand
\(at @ at
\(sh # hash (pound)
\(CR <cr> carriage return
\(OK \/ check mark
\(CL C club suit
\(SP S spade suit
\(HE H heart suit
\(DI D diamond suit

Legal symbols:
Input Rendered Description
\(co (C) copyright
\(rg (R) registered
\(tm tm trademarked

Input Rendered Description
\(em -- em-dash
\(en - en-dash
\(hy - hyphen
\e \ back-slash
\. . period
\(r! ! upside-down exclamation
\(r? ? upside-down question

Input Rendered Description
\(Bq ,, right low double-quote
\(bq , right low single-quote
\(lq " left double-quote
\(rq " right double-quote
\(oq ` left single-quote
\(cq ' right single-quote
\(aq ' apostrophe quote (ASCII character)
\(dq " double quote (ASCII character)
\(Fo << left guillemet
\(Fc >> right guillemet
\(fo < left single guillemet
\(fc > right single guillemet

Input Rendered Description
\(lB [ left bracket
\(rB ] right bracket
\(lC { left brace
\(rC } right brace
\(la < left angle
\(ra > right angle
\(bv | brace extension (special font)
\[braceex] | brace extension
\[bracketlefttp] | top-left hooked bracket
\[bracketleftbt] | bottom-left hooked bracket
\[bracketleftex] | left hooked bracket extension
\[bracketrighttp] | top-right hooked bracket
\[bracketrightbt] | bottom-right hooked bracket
\[bracketrightex] | right hooked bracket extension
\(lt ,- top-left hooked brace
\[bracelefttp] ,- top-left hooked brace
\(lk { mid-left hooked brace
\[braceleftmid] { mid-left hooked brace
\(lb `- bottom-left hooked brace
\[braceleftbt] `- bottom-left hooked brace
\[braceleftex] | left hooked brace extension
\(rt -. top-left hooked brace
\[bracerighttp] -. top-right hooked brace
\(rk } mid-right hooked brace
\[bracerightmid] } mid-right hooked brace
\(rb -' bottom-right hooked brace
\[bracerightbt] -' bottom-right hooked brace
\[bracerightex] | right hooked brace extension
\[parenlefttp] / top-left hooked parenthesis
\[parenleftbt] \ bottom-left hooked parenthesis
\[parenleftex] | left hooked parenthesis extension
\[parenrighttp] \ top-right hooked parenthesis
\[parenrightbt] / bottom-right hooked parenthesis
\[parenrightex] | right hooked parenthesis extension

Input Rendered Description
\(<- <- left arrow
\(-> -> right arrow
\(<> <-> left-right arrow
\(da |v down arrow
\(ua |^ up arrow
\(va ^v up-down arrow
\(lA <= left double-arrow
\(rA => right double-arrow
\(hA <=> left-right double-arrow
\(uA =^ up double-arrow
\(dA =v down double-arrow
\(vA ^=v up-down double-arrow
\(an - horizontal arrow extension

Input Rendered Description
\(AN ^ logical and
\(OR v logical or
\[tno] ~ logical not (text font)
\(no ~ logical not (special font)
\(te <there exists>
existential quantifier
\(fa <for all> universal quantifier
\(st <such that> such that
\(tf <therefore> therefore
\(3d <therefore> therefore
\(or | bitwise or

Input Rendered Description
\- - minus (text font)
\(mi - minus (special font)
+ + plus (text font)
\(pl + plus (special font)
\(-+ -+ minus-plus
\[t+-] +- plus-minus (text font)
\(+- +- plus-minus (special font)
\(pc . center-dot
\[tmu] x multiply (text font)
\(mu x multiply (special font)
\(c* Ox circle-multiply
\(c+ O+ circle-plus
\[tdi] / divide (text font)
\(di / divide (special font)
\(f/ / fraction
\(** * asterisk
\(<= <= less-than-equal
\(>= >= greater-than-equal
\(<< << much less
\(>> >> much greater
\(eq = equal
\(!= != not equal
\(== == equivalent
\(ne !== not equivalent
\(ap ~ tilde operator
\(|= -~ asymptotically equal
\(=~ =~ approximately equal
\(~~ ~~ almost equal
\(~= ~= almost equal
\(pt <proportional to>
\(es {} empty set
\(mo <element of>
\(nm <not element of>
not element
\(sb <proper subset>
proper subset
\(nb <not subset>
not subset
\(sp <proper superset>
proper superset
\(nc <not superset>
not superset
\(ib <subset or equal>
reflexive subset
\(ip <superset or equal>
reflexive superset
\(ca <intersection>
\(cu <union> union
\(/_ <angle> angle
\(pp <perpendicular>
\(is <integral> integral
\[integral] <integral> integral
\[sum] <sum> summation
\[product] <product> product
\[coproduct] <coproduct> coproduct
\(gr <nabla> gradient
\(sr <sqrt> square root
\[sqrt] <sqrt> square root
\(lc |~ left-ceiling
\(rc ~| right-ceiling
\(lf |_ left-floor
\(rf _| right-floor
\(if <infinity> infinity
\(Ah <Aleph> aleph
\(Im <Im> imaginary
\(Re <Re> real
\(wp p Weierstrass p
\(pd <del> partial differential
\(-h /h Planck constant over 2<pi>
\[hbar] /h Planck constant over 2<pi>
\(12 1/2 one-half
\(14 1/4 one-fourth
\(34 3/4 three-fourths
\(18 1/8 one-eighth
\(38 3/8 three-eighths
\(58 5/8 five-eighths
\(78 7/8 seven-eighths
\(S1 ^1 superscript 1
\(S2 ^2 superscript 2
\(S3 ^3 superscript 3

Input Rendered Description
\(ff ff ff ligature
\(fi fi fi ligature
\(fl fl fl ligature
\(Fi ffi ffi ligature
\(Fl ffl ffl ligature
\(ae ae ae
\(oe oe oe
\(ss ss German eszett
\(IJ IJ IJ ligature
\(ij ij ij ligature

Input Rendered Description
\(a" " Hungarian umlaut
\(a- - macron
\(a. . dotted
\(a^ ^ circumflex
\(aa ' acute
\' ' acute
\(ga ` grave
\` ` grave
\(ab '` breve
\(ac , cedilla
\(ad " dieresis
\(ah v caron
\(ao o ring
\(a~ ~ tilde
\(ho , ogonek
\(ha ^ hat (ASCII character)
\(ti ~ tilde (ASCII character)

Accented letters:
Input Rendered Description
\('A 'A acute A
\('E 'E acute E
\('I 'I acute I
\('O 'O acute O
\('U 'U acute U
\('Y 'Y acute Y
\('a 'a acute a
\('e 'e acute e
\('i 'i acute i
\('o 'o acute o
\('u 'u acute u
\('y 'y acute y
\(`A `A grave A
\(`E `E grave E
\(`I `I grave I
\(`O `O grave O
\(`U `U grave U
\(`a `a grave a
\(`e `e grave e
\(`i `i grave i
\(`o `i grave o
\(`u `u grave u
\(~A ~A tilde A
\(~N ~N tilde N
\(~O ~O tilde O
\(~a ~a tilde a
\(~n ~n tilde n
\(~o ~o tilde o
\(:A "A dieresis A
\(:E "E dieresis E
\(:I "I dieresis I
\(:O "O dieresis O
\(:U "U dieresis U
\(:a "a dieresis a
\(:e "e dieresis e
\(:i "i dieresis i
\(:o "o dieresis o
\(:u "u dieresis u
\(:y "y dieresis y
\(^A ^A circumflex A
\(^E ^E circumflex E
\(^I ^I circumflex I
\(^O ^O circumflex O
\(^U ^U circumflex U
\(^a ^a circumflex a
\(^e ^e circumflex e
\(^i ^i circumflex i
\(^o ^o circumflex o
\(^u ^u circumflex u
\(,C ,C cedilla C
\(,c ,c cedilla c
\(/L /L stroke L
\(/l /l stroke l
\(/O /O stroke O
\(/o /o stroke o
\(oA oA ring A
\(oa oa ring a

Special letters:
Input Rendered Description
\(-D Dh Eth
\(Sd dh eth
\(TP Th Thorn
\(Tp th thorn
\(.i i dotless i
\(.j j dotless j

Input Rendered Description
\(Do $ dollar
\(ct /c cent
\(Eu EUR Euro symbol
\(eu EUR Euro symbol
\(Ye =Y yen
\(Po -L pound
\(Cs ox Scandinavian
\(Fn ,f florin

Input Rendered Description
\(de <degree> degree
\(%0 <permille> per-thousand
\(fm ' minute
\(sd '' second
\(mc <micro> micro
\(Of a Spanish female ordinal
\(Om o Spanish masculine ordinal

Greek letters:
Input Rendered Description
\(*A A Alpha
\(*B B Beta
\(*G <Gamma> Gamma
\(*D <Delta> Delta
\(*E E Epsilon
\(*Z Z Zeta
\(*Y H Eta
\(*H <Theta> Theta
\(*I I Iota
\(*K K Kappa
\(*L <Lambda> Lambda
\(*M M Mu
\(*N N Nu
\(*C <Xi> Xi
\(*O O Omicron
\(*P <Pi> Pi
\(*R P Rho
\(*S <Sigma> Sigma
\(*T T Tau
\(*U Y Upsilon
\(*F <Phi> Phi
\(*X X Chi
\(*Q <Psi> Psi
\(*W <Omega> Omega
\(*a <alpha> alpha
\(*b <beta> beta
\(*g <gamma> gamma
\(*d <delta> delta
\(*e <epsilon> epsilon
\(*z <zeta> zeta
\(*y <eta> eta
\(*h <theta> theta
\(*i <iota> iota
\(*k <kappa> kappa
\(*l <lambda> lambda
\(*m <mu> mu
\(*n <nu> nu
\(*c <xi> xi
\(*o o omicron
\(*p <pi> pi
\(*r <rho> rho
\(*s <sigma> sigma
\(*t <tau> tau
\(*u <upsilon> upsilon
\(*f <phi> phi
\(*x <chi> chi
\(*q <psi> psi
\(*w <omega> omega
\(+h <theta> theta variant
\(+f <phi> phi variant
\(+p <pi> pi variant
\(+e <epsilon> epsilon variant
\(ts <sigma> sigma terminal


Predefined strings are inherited from the macro packages of historical
troff implementations. They are not recommended for use, as they differ
across implementations. Manuals using these predefined strings are almost
certainly not portable.

Their syntax is similar to special characters, using `\*X' (for a
one-character escape), `\*(XX' (two-character), and `\*[N]' (N-character).

Input Rendered Description
\*(Ba | vertical bar
\*(Ne != not equal
\*(Ge >= greater-than-equal
\*(Le <= less-than-equal
\*(Gt > greater-than
\*(Lt < less-than
\*(Pm +- plus-minus
\*(If infinity infinity
\*(Pi pi pi
\*(Na NaN NaN
\*(Am & ampersand
\*R (R) restricted mark
\*(Tm (Tm) trade mark
\*q " double-quote
\*(Rq " right-double-quote
\*(Lq " left-double-quote
\*(lp ( right-parenthesis
\*(rp ) left-parenthesis
\*(lq " left double-quote
\*(rq " right double-quote
\*(ua |^ up arrow
\*(va ^v up-down arrow
\*(<= <= less-than-equal
\*(>= >= greater-than-equal
\*(aa ' acute
\*(ga ` grave
\*(Px POSIX POSIX standard name
\*(Ai ANSI ANSI standard name


The escape sequences

\[uXXXX] and \C'uXXXX'

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 `A' to `F' 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.


For backward compatibility with existing manuals, mandoc(1) also supports

\N'number' and \[charnumber]

escape sequences, inserting the character number 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; on top of that,
the second form is a GNU extension. For example, do not use \N'34' or
\[char34], use \(dq, or even the plain `"' character where possible.


This section documents compatibility between mandoc and other troff
implementations, at this time limited to GNU troff ("groff").

- The \N'' escape sequence is limited to printable characters; in groff,
it accepts arbitrary character numbers.
- In -Tascii, the \(ss, \(nm, \(nb, \(nc, \(ib, \(ip, \(pp, \[sum],
\[product], \[coproduct], \(gr, \(-h, and \(a. special characters
render differently between mandoc and groff.
- In -Thtml, the \(~=, \(nb, and \(nc special characters render
differently between mandoc and groff.
- The -Tps and -Tpdf modes format like -Tascii instead of rendering
glyphs as in groff.
- The \[radicalex], \[sqrtex], and \(ru special characters have been
omitted from mandoc either because they are poorly documented or they
have no known representation.


mandoc(1), man(7), mandoc_roff(7), mdoc(7)


The mandoc_char manual page was written by Kristaps Dzonsons


The predefined string `\*(Ba' mimics the behaviour of the `|' character in
mdoc(7); thus, if you wish to render a vertical bar with no side effects,
use the `\(ba' escape.

illumos October 31, 2020 illumos