Radian Glacier is a glacier

Glacier

A glacier is a large persistent body of ice that forms where the accumulation of snow exceeds its ablation over many years, often centuries. At least 0.1 km² in area and 50 m thick, but often much larger, a glacier slowly deforms and flows due to stresses induced by its weight...

 on the east side of the Royal Society Range

Royal Society Range

The Royal Society Range is a majestic mountain range in Victoria Land, Antarctica. With its summit at , the massive Mount Lister forms the highest point in this range. Mount Lister is located along the western shore of McMurdo Sound between the Koettlitz, Skelton and Ferrar glaciers...

, descending from a high cirque just southeast of Mount Rucker

Mount Rucker

Mount Rucker is a mountain, 3,815 m, immediately south of Johns Hopkins Ridge in the Royal Society Range of Victoria Land. Discovered by the Discovery expedition which named it for Sir Arthur Rucker, Honorary Secretary of the Royal Society....

 and flowing east toward Walcott Glacier

Walcott Glacier

Walcott Glacier is a glacier between Radian and Howchin Glaciers, descending eastward from the Royal Society Range toward Walcott Bay. Named by Taylor of the British Antarctic Expedition , presumably for Charles D. Walcott, Director of the U.S. Geological Survey and Secretary of the Smithsonian...

. In the measurements made of this glacier by the Victoria University of Wellington Antarctic Expedition (VUWAE) (1960–61), one of the survey angles, by chance, was exactly one radian, and the glacier came to be referred to by this term.

Radian Ridge is a ridge named in association with Radian Glacier.