combination lock
type of locking device in which a sequence of symbols, usually numbers, is used to open the lock
en-GB/ˌkɒmbɪˈneɪʃən ˈlɒk/
en-US/ˌkɑmbəˈneɪʃən ˈlɑk/
type of locking device in which a sequence of symbols, usually numbers, is used to open the lock