Burelage

Burelage (French:burelage), also burelé, is a French term referring to an intricate network of fine lines, dots or other designs printed over or as the background of some postage or revenue stamps to prevent counterfeiting. In English the word is sometimes spelled with an accent on the first "e" as burélage, although the accent does not appear in the French spelling and its origin is unclear. Burelage most commonly appears as a form of underprinting.