In Norse mythology, Ull (or Ullr or Uller) is the son of Sif, and the of Thor. People think he was the god of Winter, of hunting, of hand-to-hand combat, and of the willow tree. He is married to Skadi, the goddess of winter, and the ex-wife of Njord. His name means "glory". He was said to be a great archer and skier who left blazing trails across the sky.
For this reason he is celebrated in modern times as the god of skiing. His name is used as a name for ski lodges like the House of Ullr at Thredbo, New South Wales. ULLR Labs make smartphone applications to help people avoid avalanches.