Pronunciation: [nˈɜːl] (IPA) 
The word "knurl" is spelled with a silent "k" and pronounced as /nərl/. The "k" was initially included to reflect the word's Old English origins (cnyrl). However, over time, the "k" became silent, and the word is now pronounced as /nərl/ in modern English. A knurl is a raised pattern or texture on a surface, often found on tools or machine parts to provide grip.
Knurl, a noun, refers to a small ridged or notched knob or wheel on a metal surface, designed to provide better grip or facilitate rotary motion. It is typically characterized by a series of intersecting diagonal lines or raised points, resulting in a roughened texture. Knurls are commonly found on a variety of mechanical devices, such as screws, bolts, knobs, or handles, where they serve the functional purpose of improving traction, preventing slippage, or enhancing torque application.
The primary objective of the knurl is to optimize the interaction between the user's hand or tool and the surface on which it is applied. By imparting a rough texture, knurling enhances the grip, allowing the user to exert greater force or control during rotational movements. The patterned surface achieved through knurling may vary depending on its intended use, with options ranging from shallow diamond-shaped indents to more pronounced, sharp-edged ridges.
Knurling is most commonly associated with metalworking techniques, often accomplished through a specialized tool called a knurling tool. The knurling process involves rolling or pressing firmly onto the metal surface, causing the material to displace and form the desired ridged pattern.
In addition to its functional benefits, knurling can also serve aesthetic purposes. The intricate or symmetrical patterns formed by knurled surfaces contribute to the visual appeal of certain objects, lending them a distinct and textured appearance.
The word "knurl" originated in Middle English from the Old Norse word "knǫrr" or "knǫrrl", meaning a knot in wood. It later evolved into the Middle English term "knurle" or "knirle", referring to a knot or gnarl in a tree. Over time, the word "knurle" transformed into "knurl" in modern English.
