Tai Viet Vowel Aa (U+AAB1) is a Unicode other letter from the Tai Viet 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 ꪱ or ꪱ.