turnstile

(tʉrnstīl′)

noun

  1. a post with revolving horizontal bars, placed in an entrance to allow the passage of persons but not of horses, cattle, etc.
  2. a similar apparatus, often coin-operated, used to admit persons one at a time

See turnstile in American Heritage Dictionary 4

noun
  1. A mechanical device used to control passage from one public area to another, typically consisting of several horizontal arms supported by and radially projecting from a central vertical post and allowing only the passage of individuals on foot.
  2. A similar structure that permits the passage of an individual once a charge has been paid or that counts the number of individuals passing through.

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