Round handles or controls that stick out from a surface, used for turning, adjusting, or opening something.
From Middle English 'knobbe,' possibly related to Old Norse 'knúfr' (bump) and Germanic roots meaning knot or lump. The word originally described any rounded protruding object.
Knobs are disappearing from technology—designers realized that touchscreens and flat surfaces feel more modern, but we're losing tactile feedback; this is why gaming controllers still have lots of physical knobs despite being 'digital'!
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