1) Air sock 2) Airport breeze indicator 3) Drogue 4) Sock 5) Visual signal 6) Wind cone 7) Wind sleeve 
A windsock is a conical textile tube (which resembles a giant sock, hence its name) designed to indicate wind direction and relative wind speed. Windsocks typically are used at airports and at chemical plants where there is risk of gaseous leakage. They are sometimes located alongside highways at windy locations. Wind direction is the opposite of ...
[n] - a truncated cloth cone mounted on a mast
wind sock noun a truncated cloth cone mounted on a mast; used (e.g., at airports) to show the direction of the wind