Lao Vowel Sign Uu (U+0EB9) is a Unicode nonspacing mark from the Lao block. It resides on Plane 0 (BMP, Basic Multilingual Plane), has bidirectional class NSM (nonspacing mark), is not mirrored, and has combining class 118 (Fixed Position Class Ccc118). In HTML it can be written as ູ or ູ.