a turnstile, also called a baffle gate, is a type of gate. it only allows one person to pass at a time. it can also be made so as to make one-way traffic of people. it can also make passage only to people who put in a coin, a ticket, a pass, or similar. a turnstile can be used for paid access (sometimes called a faregate when used for this). for example, it can be used in public transport as a ticket barrier or at a pay toilet.