omicron

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omicron

(ō) The 15th letter of the Greek alphabet used in stellar nomenclature usually to designate the 15th-brightest star in a constellation or sometimes to indicate a star's position in a group.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
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The Guevarra Law Defenders beat Taraka Chess Team-Lanao Sur, 3-1; GenSan Omicrons whipped Davao Chess Eagles, 3-1; M.A.