Tai Viet Tone Mai Ek (U+AABF) is a Unicode nonspacing mark from the Tai Viet block. It resides on Plane 0 (BMP, Basic Multilingual Plane), has bidirectional class NSM (nonspacing mark), is not mirrored, and has combining class 230 (Above). In HTML it can be written as ꪿ or ꪿.