Nu /njuː/ (uppercase Ν lowercase ν, also transcribed Ny; modern Greek: Νι [ni] Ni), is the 13th letter of the Greek alphabet. In the system of Greek numerals it has a value of 50. It is derived from the ancient Phoenician alphabet nun . Its Latin equivalent is N, though the lowercase resembles the Roman lowercase v ().
The name of the letter is written νῦ in Ancient Greek and traditional Modern Greek polytonic orthography, while in Modern Greek it is written νι [ni].