A "gym locker" refers to a small storage space, usually made of metal, where people keep their personal belongings, like clothes or bags, while they exercise or play sports at a gym. Full definition
Ah, that's why gym locker rooms have showers, right? (health.com)
Then there are the ones that have me wondering why they left their sanity locked in their junior high school gym locker and never returned for it. (nocturnal-lives.com)
For his upcoming show at Honor Fraser, the Los Angeles native will use a similar method to present re-formulations of found objects from the urban L.A. landscape, as part of a larger exhibition that also includes quirky assemblages that integrate gym locker room fixtures and objects inspired by the 1984 Los Angeles Olympics. (artspace.com)