a room equipped with soundproofing to block out noise

A wall or barrier built to block or reduce noise, typically found along highways or in urban areas to shield nearby residents from traffic sound.

acoustic tile or sound baffle; building material used to block out noise

The apostrophe used in Pinyin to mark the boundary between two syllables to avoid confusion, specifically when a syllable starting with "a", "o", or "e" follows another syllable.

A type of sound-deadening cardboard or thick paper used in construction; it is dense and rough-surfaced to absorb sound.