Tibetan Vowel Sign O (U+0F7C) is a Unicode nonspacing mark from the Tibetan block. It resides on Plane 0 (BMP, Basic Multilingual Plane), has bidirectional class NSM (nonspacing mark), is not mirrored, and has combining class 130 (Fixed Position Class Ccc130). In HTML it can be written as ོ or ོ.