Whistle is by a girl group.
 Both rattles and whistles were used to call for back-up in areas where neighbourhood beats overlapped, and following their success in the Metropolitan Police of London, the whistle was adopted by most police forces in the United Kingdom
 Archaeologist have found at the ruins of the ancient Greek city of Assos a terracotta whistle, most probably a childs toy putting in childrens graves as a burial gift

