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In English, ⟨t⟩ usually denotes the voiceless alveolar plosive (International Phonetic Alphabet: /t/), as in tart, tee, or ties, often with aspiration at the beginnings of words or before stressed vowels. The letter ⟨t⟩ corresponds to the affricate /t͡ʃ/ in some words as a result of yod-coalescence (for example, in words ending in -"ture", such as future).

A common digraph is ⟨th⟩, which usually represents a dental fricative, but occasionally represents /t/ (as in Thomas and thyme). The digraph ⟨ti⟩ often corresponds to the sound /ʃ/ (a voiceless palato-alveolar sibilant) word-medially when followed by a vowel, as in nation, ratio, negotiation, and Croatia.

In a few words of modern French origin, the letter T is silent at the end of a word; these include croquet and debut. and it's also silent in native words and some words of Old French origin; these include thistle and castle.

In the orthographies of other languages, ⟨t⟩ is often used for /t/, the voiceless dental plosive /t̪/, or similar sounds.

In the International Phonetic Alphabet, ⟨t⟩ denotes the voiceless alveolar plosive.

• T with diacritics: Ť ť Ṫ ṫ ẗ Ţ ţ Ṭ ṭ Ʈ ʈ Ț ț ƫ Ṱ ṱ Ṯ ṯ Ŧ ŧ Ⱦ ⱦ Ƭ ƭ ᵵ^[3] ᶵ^[4]
• Ꞇ ꞇ : Insular T,^[a] also used by William Pryce to designate the voiceless dental fricative [θ]^[5]
• ᫎ : Combining small insular t was used in the Ormulum^[6]
• ʇ : Turned small t is used in the International Phonetic Alphabet (IPA)
• 𐞯 : Modifier letter small t with retroflex hook is a superscript IPA letter^[7]
• 𝼉 : Latin small letter t with hook and retroflex hook is a symbol for a voiceless retroflex implosive^[8][9]
• 𝼍 : Latin small turned t with curl is a click letter^[10][9]
• Uralic Phonetic Alphabet-specific symbols related to T:^[11]
  • U+1D1B ᴛ LATIN LETTER SMALL CAPITAL T
  • U+1D40 ᵀ MODIFIER LETTER CAPITAL T
  • U+1D57 ᵗ MODIFIER LETTER SMALL T
  • U+1E97 ẗ LATIN SMALL LETTER T WITH DIAERESIS
• ₜ : Subscript small t was used in the Uralic Phonetic Alphabet prior to its formal standardization in 1902^[12]
• ȶ : T with curl is used in Sino-Tibetanist linguistics^[13]
• Ʇ ʇ : Turned capital T and turned small t were used in transcriptions of the Dakota language in publications of the American Board of Ethnology in the late 19th century.^[14]
• 𝼪 : Small t with mid-height left hook was used by the British and Foreign Bible Society in the early 20th century for romanization of the Malayalam language.^[15]

• 𐤕 : Semitic letter Taw, from which the following symbols originally derive:
  • Τ τ : Greek letter Tau
    • Ⲧ ⲧ : Coptic letter Taw, which derives from Greek Tau
    • Т т : Cyrillic letter Te, also derived from Tau
    • 𐍄 : Gothic letter tius, which derives from Greek Tau
    • 𐌕 : Old Italic T, which derives from Greek Tau, and is the ancestor of modern Latin T
      • ᛏ : Runic letter teiwaz, which probably derives from old Italic T
• ፐ : One of the 26 consonantal letters of the Ge'ez script. The Ge'ez abugida developed under the influence of Christian scripture by adding obligatory vocalic diacritics to the consonantal letters. Pesa ፐ is based on Tawe ተ.

• ™ : Trademark symbol
• ₮ : Mongolian tögrög
• ₸ : Kazakhstani tenge
• ৳ : Bangladeshi taka

Unicode:

• U+0054 T LATIN CAPITAL LETTER T
• U+0074 t LATIN SMALL LETTER T
• U+FF34 Ｔ FULLWIDTH LATIN CAPITAL LETTER T
• U+FF54 ｔ FULLWIDTH LATIN SMALL LETTER T

Codepoints 0054₁₆ (84₁₀) and x0074₁₆ (116₁₀) were used for encodings based on ASCII, including the DOS, Windows, ISO-8859 and Macintosh families of encodings.