1 Note that all `charXXX' entity names have been removed from the font files.
2 They don't make sense for Unicode.
4 The following from the original troff manual (by Ossanna and Kernighan) is
7 \(bs shaded solid ball (Bell System logo, AT&T logo)
9 Character 0x002D has not been given a name because its Unicode name
10 "HYPHEN-MINUS" is so ambiguous that it's unusable for serious typographic use.
12 The following, mentioned in the original troff manual, are only approximate:
14 \(lk middle part of big left curly brace
15 \(rk middle part of big right curly brace
17 \(wp has been mapped to 0x2118, because according to unicode.org's
18 NamesList-3.0.0.txt, U+2118 "SCRIPT CAPITAL P" is really a Weierstrass p,
19 neither SCRIPT not CAPITAL.
21 The following lines could be added, to define names which are known to
22 "devps" but are not documented and not known to "devdvi".
38 The following lines could be added, to define names which are known to e.g.
39 "devdvi" but are not known to "devps".
43 "devps" maps \(a~ and ~ to asciitilde, which is equivalent to 0x02DC, but
44 this glyph is just too small. We map them to 0x007E instead.
46 "devps" maps \(a^ and ^ to circumflex, which is equivalent to 0x02C6, but
47 this glyph is just too small. We map them to 0x005E instead.
49 "devps" maps *U to Upsilon1, which is equivalent to 0x03D2. We map it to
52 "devps" maps *W to Omega, which is equivalent to either 0x2126 or 0x03A9. We
55 "devps" maps *D to Delta, which is equivalent to either 0x2206 or 0x0394. We
58 "devps" maps CR to carriagereturn, which is equivalent to 0x21B5. We map it
61 Using unnamed characters:
63 Assume you want to use a Unicode character not provided in the list, say
64 U+20AC. You need to do two things:
70 (the second column is computed as 24 * wcwidth(0x20AC)) to the file
71 R.proto, or, when groff is already installed, to the four fonts files in
72 $(prefix)/share/groff/<version>/font/devutf8/.
74 - In your source file, use the notation \N'8364' where 8364 is the decimal
75 representation of 0x20AC.