noun. A tapered fabric tube pivotally attached to a standard, that indicates the direction of the wind blowing through it.

noun. a large, conical, open-ended tube designed to indicate wind direction and relative wind speed; used especially at smaller airfields

noun. a truncated cloth cone mounted on a mast; used (e.g., at airports) to show the direction of the wind

"In the interview Spinrad described it as a giant "windsock," and notes that Gene Roddenberry (Trek's producer/creator) apologized that this was the best they could do with no budget left."

Winsock  weather vane  weathercock  weathervane  

visual signal  

alarm bell  bizkit  bounceback  brainer  cowry