Psi Persei (Psi Per, ψ Persei, ψPer) is a single Be star in the northern constellation of Perseus. It has an apparent visual magnitude of about 4.2, so
or psi in Wiktionary, the free dictionary. Psi, PSI or Ψ may refer to: Psi (Greek) (Ψ or ψ), the twenty-third letter of the Greek alphabet Psi (Cyrillic)