Weathercock
From BiblePortal Wikipedia
Webster's Dictionary [1]
(1): ( n.) Hence, any thing or person that turns easily and frequently; one who veers with every change of current opinion; a fickle, inconstant person.
(2): ( v. t.) To supply with a weathercock; to serve as a weathercock for.
(3): ( n.) A vane, or weather vane; - so called because originally often in the figure of a cock, turning on the top of a spire with the wind, and showing its direction.
Cyclopedia of Biblical, Theological and Ecclesiastical Literature [2]
is a weather vane, on which is the metal or wooden representation of a cock, placed on the top of a spire, which vane turns by the force and direction of the wind.