Greek Capital Letter Omicron With Psili (U+1F48) is a Unicode uppercase letter from the Greek Extended block. It resides on Plane 0 (BMP, Basic Multilingual Plane), has bidirectional class L (left-to-right), is not mirrored, and has combining class 0 (Not Reordered). In HTML it can be written as Ὀ or Ὀ.