Turnstile
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A revolving frame in a footpath, preventing the passage
of horses or cattle, but admitting that of persons; a turnpike. See
Turnpike, n., 1.Turnstile meaning & definition 1 of Turnstile.
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a mechanical barrier with arms that are turned to [admit one] person at a time, a gate consisting of a post that acts as a [pivot] for rotating arms; set in a [passageway] for controlling the persons entering
Turnstile meaning & definition 2 of Turnstile.
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a device that controls the way into or out of a building, room, or area of land, especially one that you have to pay to enter. It is a post with a number of short poles sticking out from it that have to be pushed round as each person walks through the entrance:
Turnstile meaning & definition 3 of Turnstile.