Psi (letter) (generalized) positional states of a qubit in a quantum computer. Psi is also used as the symbol for the polygamma function, defined by where formula_3 is the gamma function. The letters Ψ or ψ can also be a symbol for: These characters are used only as mathematical symbols. Stylized Greek text should be encoded using the normal Greek letters, with markup and formatting to indicate text style. Psi (letter) Psi (; uppercase ', lowercase '; "psi" ) is the 23rd letter of the Greek alphabet and has a numeric value of 700. In both Classical and Modern Greek, the letter
Latin alphabet Hyginus in "Fab. 277" mentions the legend that it was Carmenta, the Cimmerian Sibyl, who altered fifteen letters of the Greek alphabet to become the Latin alphabet, which her son Evander introduced into Latium, supposedly 60 years before the Trojan War, but there is no historically sound basis to this tale.) The Ancient Greek alphabet was in turn based upon the Phoenician abjad. From the Cumae alphabet, the Etruscan alphabet was derived and the Romans eventually adopted 21 of the original 27 Etruscan letters: Latin included 21 different characters. The letter was the western form of the Greek gamma, but