ref: 6974a1ecb6474800b19113d1b83c23a2d275c88b
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