Omicron Orionis refers to two distinct star systems in the constellation Orion:
ο1 Orionis (4 Orionis), an M3S semiregular variable star ο2 Orionis (9 Orionis), a K2 giant star
All of them were member of asterism 參旗 (Sān Qí), Banner of Three Stars, Net mansion. AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 (Astronomy Education News) 2006 年 7 月 13 日 (2006-07-13)
See also o Orionis (22 Orionis)
References