turnstile
/ˈtɜrnˌstaɪl/
noun
- A mechanical gate with rotating arms that allows one person to pass through at a time, often used at entrances to control access.
- You need to scan your ticket at the turnstile to enter the subway station.
- He pushed through the turnstile and entered the stadium just before the game started.
- The museum installed a new turnstile to count visitors more accurately.