Knurl n. : A contorted knot in wood; a crossgrained protuberance; a nodule; a boss or projection.

Knurl n. : One who, or that which, is crossgrained.

Knurl v. t. : To provide with ridges, to assist the grasp, as in the edge of a flat knob, or coin; to mill.

Example:
what does the term "Knurl" mean when talking about lug studs?

Taxonomy
Knurling, knurl, roller, pattern, workpiece, knurled, wheels, knurling tool, free encyclopedia, Hand knurling, knurling tools, criss-cross, ridges, Rings, metal pin, diamond, pitch, repair method.

Defination from the web:
knurl cutting is usually accomplished using the same automatic-feed mechanisms that are used to ... It is possible for a "straight" knurl (not criss-crossed) to be pressed with a single roller, however the material needs to be supported adequately to avoid deformation. ...