 The name, derived from the 18th letter of the Greek alphabet, appears to have been first used on a 1946 Argentine government chart following surveys of these islands by Argentine expeditions in 1942 and 1943.Sigurd Knolls

Sigurd Knolls () is an isolated rock knolls at the north end of Otter Plain, about 20 miles (32 km) northwest of Drygalski Mountains in Queen Maud Land.Plotted from surveys and air photos by the Norwegian Antarctic Expedition (1956–60) and named for Sigurd Helle, geodesist and leader of Norwegian Antarctic Expedition (1956–60).