turnstile
Definition
A mechanical gate consisting of revolving horizontal arms fixed to a vertical post, allowing one person at a time to pass through, commonly used at entrances to subways, stadiums, or amusement parks.
A similar device or barrier that controls access or counts entries, often found in public venues.
In formal logic and mathematics, the turnstile symbol (⊢), representing logical entailment, provability, or derivation.
Examples
The subway turnstile rejected my card three times, as if judging my entire life choices before letting me through.
At the gym, the turnstile beeped triumphantly when the newbie finally squeezed past after a cardio warm-up just to enter.
The philosopher sketched a massive turnstile on the whiteboard, claiming it proved Mondays derive from poor weekend decisions.
Festival-goers danced around the broken turnstile, turning the entrance into an impromptu conga line.