(geometry) A right triangle.

(geometry) An obtuse triangle.

(geometry) An acute triangle.

(photography) A short focal length lens having a wide field of view.

A unit (equal to one "ordinary" degree) used to measure the piston travel (position) e.g. to adjust ignition. When the piston is at its highest point, known as the top dead center (TDC), the crankshaft angle (crank angle) is at 0 crank angle degrees (CAD).

plural of wide-angle lens

plural of right-angled triangle

plural of crank angle degree

plural of acute-angled triangle

plural of narrow-angle lens