windsock

(-säk′)

noun

a long, cone-shaped cloth bag, open at both ends and attached to the top of a mast, as at an airfield, to show wind direction
also called wind sleeve

See windsock in American Heritage Dictionary 4

noun
A tapered, open-ended sleeve pivotally attached to a standard, that indicates the direction of the wind blowing through it. Also called air sock, wind cone, wind sleeve.

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