olemus
(a) pöörduksena toimiv mitmetiivaline metallvärav
Wiktionary:
1. a rotating mechanical device that controls and counts passage between public areas, especially one that only allows passage after a charge has been paid

(b) muu "läbipääsudosaator", mis laseb inimesi läbi ükshaaval
Wiktionary:
2. a similar device in a footpath to allow people through one at a time

näiteid
https://duckduckgo.com/?q=turnstile&t=h_&iax=images&ia=images

ülevaateid
https://en.wikipedia.org/wiki/Turnstile