Vārdnīca
Guilloche —
guilloche a.k.a. Engine Turning is an engraving technique in which a very precise intricate repetitive patterns or design is mechanically etched into an underlying material with very fine detail. Specifically, it involves a technique of engine turning, called guilloche in French, after the French engineer "Guillot", who invented a machine that could scratch fine patterns and designs on metallic surfaces. See Engine Turning