<P> A barber's pole is a type of sign used by barbers to signify the place or shop where they perform their craft . The trade sign is, by a tradition dating back to the Middle Ages, a staff or pole with a helix of colored stripes (often red and white in many countries, but usually red, blue, and white in the United States). The pole may be stationary or may revolve, often with the aid of an electric motor . </P> <P> A "barber's pole" with a helical stripe is a familiar sight, and is used as a secondary metaphor to describe objects in many other contexts . For example, if the shaft or tower of a lighthouse has been painted with a helical stripe as a daymark, the lighthouse could be described as having been painted in "barber's pole" colors . Likewise, borders may be marked and warnings highlighted . </P> <P> During medieval times, barbers performed surgery on customers, as well as tooth extractions . The original pole had a brass wash basin at the top (representing the vessel in which leeches were kept) and bottom (representing the basin that received the blood). The pole itself represents the staff that the patient gripped during the procedure to encourage blood flow . </P>

Where did the barber shop pole come from