Figure 172.—Terminology of triangular adzes:

1, front; 2, back; 3, sides; 4, front edges; 5, back edges; 6, median ridge; 7, poll; 8, bevel; 9, edge (cutting); 10, chin. Triangular adz with front median ridge: a, front; showing median ridge (6), small triangular front surface (1), two sides (3), and back edges (5); b, back, showing wide back (2), quadrangular bevel (8), transverse chin (10), and back edges (5). Triangular adz with back median ridge: c, front; wide front surface (1) and front edges (4); d, back; median ridge (6), two sides (3), triangular bevel (8), chin reduced to a point (10), and front edges (4).