Latin letter T with diaeresis

is a modified letter of the Latin alphabet, derived from the letter T with a double dot on it. It is used in the ISO 233 transliteration of Arabic to represent tāʼ marbūṭa (ﺓ, ﺔ), and also in the Uralic Phonetic Alphabet to represent a tenuis interdental stop [t̪͆]. It is also used in the Ixtlán Zapotec language.

Only the minuscule form exists in Unicode as a distinct character. The majuscule must be formed with a combination of T and a combining diaeresis (T̈), and because of this may not display correctly when using some fonts or systems. A character visually similar to the majuscule form called U+2361 APL FUNCTIONAL SYMBOL UP TACK DIAERESIS exists in Unicode.

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