9base

revived minimalist port of Plan 9 userland to Unix
git clone git://git.suckless.org/9base
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RC (215B)

      1 /build_RC {
      2     pop
      3     size 4 div /side exch def
      4     currentpoint
      5     newpath
      6     moveto
      7     0 side 1.5 mul rmoveto
      8     0 side rlineto
      9     side 2.5 mul 0 rlineto
     10     0 side neg rlineto
     11     closepath
     12     fill
     13 } def