Buginese Vowel Sign U (U+1A18) is a Unicode nonspacing mark from the Buginese block. It resides on Plane 0 (BMP, Basic Multilingual Plane), has bidirectional class NSM (nonspacing mark), is not mirrored, and has combining class 220 (Below). In HTML it can be written as ᨘ or ᨘ.