turnstile

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turnstile

Logic a symbol of the form ├, ÿE;, or ╟, used to represent logical consequence when inserted between expressions to form a sequent, or when prefixed to a single expression to indicate its status as a theorem

turnstile

[′tərn‚stīl]
(engineering)
A barrier that rotates about a vertical axis and usually is arranged to allow the passage of only one person at a time through an opening.

turnstile

A barrier which rotates on an axis and usually is so arranged as to allow the passage of a person through an opening only in one direction, one person at a time.