windsock

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windsock

a truncated cone of textile mounted on a mast so that it is free to rotate about a vertical axis: used, esp at airports, to indicate the local wind direction
References in periodicals archive ?
Save PS53 by purchasing 10 open jump sessions for the price of PS5, plus a free pair of Go Air socks, at Wales' largest trampoline park.
African drummers, air socks in the shape of fish, faculty, women
Supply and extract and productionhall ventilation systems including air socks and filtration plant, automatic controls, fan coil units and VRV (variable refrigerent volume) cooling systems were also fitted.