+ A thin, blue arrow
+ A short, thin, blue line corsses the arrow at the starting point

GRAPHREP
PEN color:blue
EDGE

START
LINE x1:0cm y1:0.2cm x2:0cm y2:-0.2cm
END
LINE x1:-.3cm y1:.1cm x2:0cm y2:0cm
LINE x1:-.3cm y1:-.1cm x2:0cm y2:0cm