the.com/idiophone

An instrument that's already a sound, no strings or skin required — just hit it.

means A musical instrument that produces sound mainly from its own solid material vibrating, without needing strings, membranes, or reeds — think bells, cymbals, xylophones, or maracas.

from Built from Greek parts: 'idio-' (ἴδιος), meaning 'one's own' or 'personal,' and 'phone' (φωνή), meaning 'sound' or 'voice.' So an idiophone is literally a thing that voices its own sound — it needs no stretched string or taut skin to sing, the body of the instrument itself is the vibrating source. The term comes from the Hornbostel-Sachs system, a classification scheme devised in the early 20th century to sort the world's instruments by how they actually make noise rather than by culture or shape.

etymology
Greek for self-sounding, no middleman needed
examples
xylophone, cymbals, triangle, your car keys
classification
first branch of the Hornbostel-Sachs instrument system
technicality
the whole object vibrates, not a string or membrane
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