<P> Although partly functional , weather vanes are generally decorative , often featuring the traditional cockerel design with letters indicating the points of the compass . Other common motifs include ships , arrows and horses . Not all weather vanes have pointers . When the wind is sufficiently strong , the head of the arrow or cockerel ( or equivalent depending on the chosen design ) will indicate the direction from which the wind is blowing . </P>
where does the arrow of a wind vane point
the direction from which the wind is blowing