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+The following from the original troff manual (by Ossanna and Kernighan) is
+unmapped:
+
+ \(bs shaded solid ball (Bell System logo, AT&T logo)
+
+Character 0x002D has not been given a name because its Unicode name
+"HYPHEN-MINUS" is so ambiguous that it's unusable for serious typographic use.
+
+The following, mentioned in the original troff manual, are only approximate:
+
+ \(lk middle part of big left curly brace
+ \(rk middle part of big right curly brace
+
+\(wp has been mapped to 0x2118, because according to unicode.org's
+NamesList-3.0.0.txt, U+2118 "SCRIPT CAPITAL P" is really a Weierstrass p,
+neither SCRIPT not CAPITAL.
+
+The following lines could be added, to define names which are known to
+"devps" but are not documented and not known to "devdvi".
+space 24 0 0x0020
+vS 24 0 0x0160
+vs 24 0 0x0161
+:Y 24 0 0x0178
+vZ 24 0 0x017D
+vz 24 0 0x017E
+3d 24 0 0x2234
+nb 24 0 0x2284
+product 24 0 0x220F
+sum 24 0 0x2211
+SP 24 0 0x2660
+CL 24 0 0x2663
+HE 24 0 0x2665
+DI 24 0 0x2666
+
+The following lines could be added, to define names which are known to e.g.
+"devdvi" but are not known to "devps".
+<< 24 0 0x226A
+>> 24 0 0x226B
+
+"devps" maps \(a~ and ~ to asciitilde, which is equivalent to 0x02DC, but
+this glyph is just too small. We map them to 0x007E instead.
+
+"devps" maps \(a^ and ^ to circumflex, which is equivalent to 0x02C6, but
+this glyph is just too small. We map them to 0x005E instead.
+
+"devps" maps *m to mu, which is equivalent to either 0x00B5 or 0x03BC. We
+map it to 0x03BC.
+
+"devps" maps *U to Upsilon1, which is equivalent to 0x03D2. We map it to
+0x03A5 instead.
+
+"devps" maps *W to Omega, which is equivalent to either 0x2126 or 0x03A9. We
+map it to 0x03A9.
+
+"devps" maps *D to Delta, which is equivalent to either 0x2206 or 0x0394. We
+map it to 0x0394.
+
+"devps" maps CR to carriagereturn, which is equivalent to 0x21B5. We map it
+to 0x240D instead.
+
+Using unnamed characters:
+
+Assume you want to use a Unicode character not provided in the list, say
+U+20AC. You need to do two things:
+
+- Add a line
+
+ --- 24 0 0x20AC
+
+ (the second column is computed as 24 * wcwidth(0x20AC)) to the file
+ R.proto, or, when groff is already installed, to the four fonts files in
+ $(prefix)/share/groff/<version>/font/devutf8/.
+
+- In your source file, use the notation \N'8364' where 8364 is the decimal
+ representation of 0x20AC.
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