ref: 2fbb841b2fe9333f64cb583ba1d7936cd9bdb2ec
dir: /sys/lib/troff/font/devutf/charlib/RC/
/build_RC {
pop
size 4 div /side exch def
currentpoint
newpath
moveto
0 side 1.5 mul rmoveto
0 side rlineto
side 2.5 mul 0 rlineto
0 side neg rlineto
closepath
fill
} def