Omicron Leonis (ο Leonis, abbreviated Omicron Leo, ο Leo) is a multiple star system in the constellation of Leo, west of Regulus, some 130 light-years from the Sun, where it marks one of the lion's forepaws. It consists of a binary pair, designated Omicron Leonis A and an optical companion, Omicron Leonis B. A's two components are themselves designated Omicron Leonis Aa (officially named Subra /ˈsuːbrə/, the traditional name for the system) and Ab.