arrowhead
ar.row.head \'ar-o--.hed, 'ar-*-\ n 1: the usu. separate wedge-shaped striking end of an arrow 2: something resembling an arrowhead; specif : a wedge-shaped mark on a drawing to limit a dimension line 3: any of a genus (Sagittaria) of plants of the water-plantain family with leaves shaped like arrowheads