Combining Greek Ypogegrammeni (U+0159) is a Unicode nonspacing mark from the Combining Diacritical Marks block. It resides on Plane 0 (BMP, Basic Multilingual Plane), has bidirectional class NSM (nonspacing mark), is not mirrored, and has combining class 240 (Iota Subscript). In HTML it can be written as ͅ or ͅ.