Hi-hat - Wikipedia

Hi-hat - Wikipedia: "X-hats[edit source]
An X-hat is an adapter to allow a pair of hi-hat cymbals to be mounted in a closed position on a cymbal stand. There is no pedal, the hats are simply kept closed at a constant tension, similar to a cymbal stack."

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For example, Yamaha CHH920.

figured adjective - Definition, pictures, pronunciation and usage notes | Oxford Advanced Learner's Dictionary at OxfordLearnersDictionaries.com

figured adjective - Definition, pictures, pronunciation and usage notes | Oxford Advanced Learner's Dictionary at OxfordLearnersDictionaries.com: "decorated with a small pattern"

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Tangent bundle - Wikipedia

Tangent bundle - Wikipedia: "One of the main roles of the tangent bundle is to provide a domain and range for the derivative of a smooth function. Namely, if f : M → N is a smooth function, with M and N smooth manifolds, its derivative is a smooth function Df : TM → TN.
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Vinyl group - Wikipedia

Vinyl group - Wikipedia: "An industrially important example is vinyl chloride, precursor to PVC, a plastic commonly known as vinyl.
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Detent - Wikipedia

Detent - Wikipedia: "Detents are for example used to simply arrest rotation in one direction or to intentionally divide a rotation into discrete increments.
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Fingering (music) - Wikipedia

Fingering (music) - Wikipedia: "Simple flutes (including recorders) as well as bagpipe chanters have open holes which are closed by the pads of the player's fingertips. "

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