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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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