‘钥匙’ (yào shi) is a compound noun meaning ‘key’ — specifically a physical object used to lock or unlock doors, cabinets, cars, or other mechanisms. The first character 钥 (yào) historically refers to a type of lock or locking device, while the second character 匙 (shi) means ‘spoon’ but in this compound has evolved to denote a tool for operating something — together they form a single lexical unit meaning ‘key’. Unlike English, where ‘key’ can also mean ‘crucial factor’ or ‘keyboard key’, 钥匙 refers exclusively to tangible, mechanical keys.

This word is commonly used in daily life — for example, when talking about losing, carrying, borrowing, or handing over keys. It’s always countable and typically appears with measure words like ‘一把’ (yì bǎ, ‘one [flat object]’) because keys are small, flat, handheld objects. You’ll hear it in contexts like home security, commuting (car keys), or office access. It does not refer to digital or virtual keys (e.g., encryption keys), which use different terms like ‘密钥’ (mì yuè).