"In the field of lithic reduction, a burin /ˈbjuːrɪn/ (from the French burin, meaning "cold chisel" or modern engraving burin) is a type of handheld lithic flake with a chisel-like edge which prehistoric humans used for engraving or for carving wood or bone.
Burins exhibit a feature called a "burin spall", in which toolmakers strike a small flake obliquely from the edge of the burin flake in order to form the graving edge." - (en.wikipedia.org 04.07.2021)
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