For the same ligature was also used in the context of Cyrillic, see Uk (Cyrillic) and 8. Ou (Majuscule: Ȣ, Minuscule: ȣ) is a ligature of the Greek letters ο and υ which was frequently used in Byzantine manuscripts. This omicron-upsilon ligature is still seen today on icon artwork in Greek Orthodox churches, and sometimes in graffiti or other forms of informal or decorative writing. The ligature i