WordNet sense 1 (a truncated cloth cone mounted on a mast; used (e.g., at airports) to show the direction of the wind):

sock, windsock, air-sleeve, air sock, wind cone, wind sleeve

WordNet sense 2 (restraint consisting of a canvas covered frame that floats behind a vessel; prevents drifting or maintains the heading into a wind):

sea anchor

WordNet sense 3 (a parachute used to decelerate an object that is moving rapidly):

drogue parachute, drogue chute