Reciprocation in geometry, an operation with circles that involves transforming each point in plane into its polar line and each line in the plane into its pole
North Pole | South Pole | Order of the Polar Star | Zarya (polar ship) | The Polar Express | Steel Pole Bath Tub | Margaret Pole, Countess of Salisbury | William de la Pole, 1st Duke of Suffolk | William de la Pole | totem pole | Polar Studios | Polar Satellite Launch Vehicle | North Pole, Alaska | Legnickie Pole | Ten Foot Pole | South Pole Telescope | South Polar Skua | Sir Richard Pole | Scott Polar Research Institute | polar region | New Pole for Italy | International Polar Year | Byrd Polar Research Center | Amundsen–Scott South Pole Station | women's pole vault | William Pole Thornhill | Utility pole | The Polar Express (film) | The Little Polar Bear | Sir John de la Pole, 6th Baronet |