A turnstile, also called a baffle gate or turnstile, is a form of gate which allows one person to pass at a time. It can also be made so as to enforce one-way traffic of people, and in addition, it can restrict passage only to people who insert a coin, a ticket, a pass, or similar.

Thus a turnstile can be used in the case of paid access (some- times called a fare gate or ticket barrier when used for t his purpose), for example to access public transport, a pay toilet, or to restrict access to authorized people, for example in the lobby of an office building.