The letter ? (minuscule: ?), called T with retroflex hook, is a letter of the Latin alphabet based on the letter t. It is used to represent a voiceless retroflex plosive in the International Phonetic Alphabet, and is used some alphabets of African languages. A ligature of ? with h was part of the Initial Teaching Alphabet to represent the voiceless dental fricative.
The majuscule and the minuscule are located at U+01AE and U+0288 in Unicode, respectively.