U+1843 MONGOLIAN LETTER TODO LONG VOWEL SIGN

The Unicode character U+1843, officially named MONGOLIAN LETTER TODO LONG VOWEL SIGN, was introduced in Unicode version 3.0. It is part of the Mongolian block, which belongs to the Basic Multilingual plane.

Categorized technically as a Modifier Letter, this character typically falls under the Mong script. In terms of text layout and rendering, the glyph is not a composition and has no designated width in East Asian typography. When placed in bidirectional text, it behaves as an Left-To-Right character. Its visual representation remains not mirrored regardless of the reading direction.