1) Military terminology 
A Crémaillère is a French, mechanical term for the rack, or a straight bar with teeth on one edge designed to work into the teeth of a wheel or a pinion (French pignon) that predates the Renaissance. The term was generally applied in English to engineering applications which had notched, toothed or drilled surface, even when only visually so, su...
zigzag line of fortification
• (n.) An indented or zigzaged line of intrenchment.
Cré`mail`lère' noun [ French] (Fort.) An indented or zigzaged line of intrenchment.