kite-shaped
... that ten-sided gaming dice have kite-shaped faces?
... that ten-sided gaming dice <i id="mwBX4">(examples pictured)</i> have <b id="mwBX8"><a href="./Kite_(geometry)" id="mwBYA" rel="mw:WikiLink" title="Kite (geometry)">kite-shaped</a></b> faces?