U+1EA0 "Ạ" Latin Capital Letter A with Dot Below Unicode Character

U+1EA0 "Ạ" Latin Capital Letter A with Dot Below is a modified version of the standard Latin letter A, distinguished by a subscript dot placed directly under the character. This diacritical mark is commonly used in the Vietnamese alphabet, where it represents a distinct low, creaky, or falling tone applied to the vowel "A," specifically the nặng tone. In Vietnamese orthography, the letter can also appear with additional tone marks, such as Ạ̀, Ạ́, Ạ̃, or Ạ̉, to indicate different pitch contours. Beyond Vietnamese, the dot below diacritic appears in other romanization systems and languages, such as certain transliterations of African or Indian scripts, often to denote a retroflex or other phonetically distinct variant of the base letter.