Tai Viet Symbol Sam (U+AADD) is a Unicode modifier 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 ꫝ or ꫝ.