And the number 700 is represented by the symbol for this letter. The classical Greek letter was adopted into the early Cyrillic alphabet as 'Ѱ'. Psi (uppercase, lowercase ) is the 23rd letter of the Modern Greek alphabet.

The Western letter (expressing /kʰ/, later /x/) was adopted into the Old Italic alphabets, and its shape is also continued into the Algiz rune of the Elder Futhark. There were early graphical variants that omitted the stem ('chickenfoot-shaped psi' as: Greek Psi V-shaped.svg or Greek Chi 05.svg). In writing, the early letter appears in an angular shape (Greek Psi straight.svg). It appears in the 7th century BC, expressing /ps/ in the Eastern alphabets, but /kʰ/ in the Western alphabets (the sound expressed by Χ in the Eastern alphabets). It may or may not derive from the Phoenician alphabet. Careful 'Sigma' includes the compound letters psi (p+s) and xi (k+s). In both Classical and Modern Greek, the letter indicates the combination /ps/ (as in English word 'lapse'). Greek words can only end with a vowel, or with nu (), sigma () or rho (). Psi (uppercase Ψ, lowercase ψ Greek: ψι psi) is the 23rd letter of the Greek alphabet and has a numeric value of 700. It is encoded in the Greek and Coptic block, which belongs to the Basic Multilingual Plane. Ψ, in physics, is the symbol used to represent the quantum-mechanical wave-function. The character (Greek Capital Letter Psi) is represented by the Unicode codepoint U+03A8. In addition, writing the Greek language, the letters are also widely used as symbols in mathematics, chemistry, engineering, physics, and science today. Alpha is the first letter of the alphabet, and the last letter is omega. Ψ, in astrology, is the symbol that represents Neptune. There are 24 letters in the Greek alphabet. Ψ, in biological terms, is a symbol used to represent water potential. For example: Ψ = Psychology Ψist = Psychologist. The Greek capital letter psi is often used to represent the word, or study of, Psychology. Greek Capital Letter Psi U+03A8 Why is the symbol not displayed Copy Symbol Meaning Greek Capital Letter Psi.