The term METEOROLOGY TOOL can be summarized as a tool used to measure wind direction. A VANE, which is a four-letter word, is a common meteorology tool used to measure wind direction. It is typically a flat plate or fin attached to a rotating spindle that is mounted on a pole or building. The direction of the wind is indicated by the direction the VANE points. Vanes are often used in weather stations and other meteorological applications.