Rough breathing mark, a reversed comma shape indicating an h sound in polytonic ancient Greek, standalone form.
U+1FFDGREEK OXIAU+1FFCGREEK CAPITAL LETTER OMEGA WITH PROSGEGRAMMENIU+1FFBGREEK CAPITAL LETTER OMEGA WITH OXIAU+1FFAGREEK CAPITAL LETTER OMEGA WITH VARIAU+1FF9GREEK CAPITAL LETTER OMICRON WITH OXIAU+1FF8GREEK CAPITAL LETTER OMICRON WITH VARIAU+1FF7GREEK SMALL LETTER OMEGA WITH PERISPOMENI AND YPOGEGRAMMENIU+1FF6GREEK SMALL LETTER OMEGA WITH PERISPOMENIU+1FF4GREEK SMALL LETTER OMEGA WITH OXIA AND YPOGEGRAMMENIU+1FF3GREEK SMALL LETTER OMEGA WITH YPOGEGRAMMENIU+1FF2GREEK SMALL LETTER OMEGA WITH VARIA AND YPOGEGRAMMENIU+1FEFGREEK VARIA233 characters in the Greek Extended Unicode block, from number 233.