A contrivance attached to some elevated object for the purpose of showing which way the wind blows; a weathercock. It is usually a plate or strip of metal, or slip of wood, often cut into some fanciful form, and placed upon a perpendicular axis around which it moves freely.
- A weathervane.
- Any of several usually relatively thin, rigid, flat, or sometimes curved surfaces radially mounted along an axis, as a blade in a turbine or a sail on a windmill, that is turned by or used to turn a fluid.
- The flattened, weblike part of a feather, consisting of a series of barbs on either side of the shaft.
- The movable target on a leveling rod.
- A sight on a quadrant or compass.
- One of the metal guidance or stabilizing fins attached to the tail of a bomb or other missile.