Ot ( ; italics: <span style="font-family: times, Times New Roman, serif; font-size: larger"> </span>) is a letter of the early Cyrillic alphabet. Though it originated as a ligature of the letters Omega ( ) and Te ( ), it functions as a discrete letter of the alphabet, placed between and . This can be seen in the first printed Cyrillic abecedarium (illustrated), and continues in modern usage.
Ot is used in Church Slavonic to represent the preposition 'from' and prefix . It does not stand for this sequence of letters in any other context, nor can the sequence be substituted for it where it does occur. It is used with a similar purpose in mediaeval manuscripts of other Slavonic languages written with the Cyrillic alphabet. In printed books is often used in preference to for the numeral 800.