Phi (capital φ, lowercase φ, Chinese transliteration: Buddha's love, Fiji) is the 2nd1Greek letter. Greek lowercase letters, the bend in the upper left corner is open; When used as a symbol, it is generally written as a reduced capital Φ shape (Unicode: U+03D5). Usage: capital φ is used for: physical magnetic flux electrically indicates whether the power supply is single-phase or three-phase, for example: 1φ, 3φ. Used for: physically fluctuating phase current, voltage, potential in phase static electricity, symbol of golden section, mathematical complex number (independent variable of complex number), angle between straight line and Z axis, Euler function φ bond, a theoretical chemical bond, abbreviation of phenyl in organic chemistry () is a symbol similar to phi, but in fact it is not the Greek letter phi, but the Latin letter in Nordic language, used for: engineering.

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