U+AAB7 "ꪷ" Tai Viet Mai Khit Unicode Character

U+AAB7 "ꪷ" Tai Viet Mai Khit is a combining diacritical mark used in the Tai Viet script, which is employed to write several Tai languages, including Tai Dam and Tai Don, primarily in Vietnam, Laos, and Thailand. This specific mark, known as Mai Khit, appears above a consonant character to indicate a high-rising tone, a crucial tonal distinction in these languages that affects word meaning. Represented in Unicode since version 5.2 in 2009, it is part of the Tai Viet block and functions as a modifier character, joining with a base consonant to form a complete syllable in the writing system.