Tai Tham Vowel Sign Ai (U+1A71) is a Unicode spacing combining mark from the Tai Tham 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 ᩱ or ᩱ.