إسفين

Etymology
From, probably also through ,. However in the sense sphene, titanite its alternative form has, it is from from the same Greek word, for mineralogist  has coined this name in 1801 (Traité de minéralogie vol. 3 p. 114).

Noun

 * 1) wedge (in many senses, including in wedge-writing and as a simple machine)