Barber Pole

Origin of barber pole in hairdressing and surgery A barber's pole is a type of sign used by barbers, a pole with white and red stripes. They have however been known to be of different colors. For example, it was common practice to have black and yellow stripes in the City of Baltimore, Maryland until the early 20th century in honor of the Calvert Colors used by Lord Baltimore.
See more at Wikipedia.org...

[Slang], a thunderstorm updraft with a visual appearance including cloud striations that are curved in a manner similar to the stripes of a barber pole. The structure typically is most pronounced on the leading edge of the updraft, while drier air from the rear flank downdraft often erodes the clouds on the trailing side of the updraft.

[GB] PALO A SPIRALI ROSSE E BIANCHE [INSEGNA DEI BARBIERI]