Lowercase Greek omega with a small iota written underneath it, the iota subscript used in polytonic Greek.
U+1FF2GREEK SMALL LETTER OMEGA WITH VARIA AND YPOGEGRAMMENIU+1FF4GREEK SMALL LETTER OMEGA WITH OXIA AND YPOGEGRAMMENIU+1FF6GREEK SMALL LETTER OMEGA WITH PERISPOMENIU+1FEFGREEK VARIAU+1FF7GREEK SMALL LETTER OMEGA WITH PERISPOMENI AND YPOGEGRAMMENIU+1FEEGREEK DIALYTIKA AND OXIAU+1FF8GREEK CAPITAL LETTER OMICRON WITH VARIAU+1FEDGREEK DIALYTIKA AND VARIAU+1FF9GREEK CAPITAL LETTER OMICRON WITH OXIAU+1FECGREEK CAPITAL LETTER RHO WITH DASIAU+1FFAGREEK CAPITAL LETTER OMEGA WITH VARIAU+1FEBGREEK CAPITAL LETTER UPSILON WITH OXIA233 characters in the Greek Extended Unicode block, from number 223.
U+1FF3GREEK SMALL LETTER OMEGA WITH YPOGEGRAMMENIU+1FF4GREEK SMALL LETTER OMEGA WITH OXIA AND YPOGEGRAMMENIU+1FF6GREEK SMALL LETTER OMEGA WITH PERISPOMENIU+1FF7GREEK SMALL LETTER OMEGA WITH PERISPOMENI AND YPOGEGRAMMENIU+1FF8GREEK CAPITAL LETTER OMICRON WITH VARIAU+1FF9GREEK CAPITAL LETTER OMICRON WITH OXIAU+1FFAGREEK CAPITAL LETTER OMEGA WITH VARIAU+1FFBGREEK CAPITAL LETTER OMEGA WITH OXIAU+1FFCGREEK CAPITAL LETTER OMEGA WITH PROSGEGRAMMENIU+1FFDGREEK OXIAU+1FFEGREEK DASIA