knurling

This term is primarily used in mechanical engineering and machining contexts. It refers specifically to the tactile result of a manufacturing process, creating a diamond or straight-line pattern that increases friction between the hand and a tool. It is a technical term of art and is rarely used in general conversation outside of industrial or DIY settings.

As a noun, it can refer to both the physical texture (the result) and the act of machining (the process). Because it describes a specific surface characteristic or a technical procedure, it is typically treated as an uncountable noun. You would refer to the quality of the knurling rather than counting individual instances of it.