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
History of the Greek alphabet depending on their place in the word. Early printers, such as Aldus Manutius and Claude Garamond, attempted to imitate this, basing their printing on the writing of Greek scribes, producing a style text similar to modern italics. As Greece was occupied by the Ottoman Empire until the nineteenth century, early printers of (mostly ancient) Greek were mostly based in western Europe; few were Greek. This led to the adoption of writing conventions for Greek such as letter case influenced by printing and developments in the Latin alphabet. Cursive-inspired Greek print slowly disappeared during the eighteenth and nineteenth centuries in favour