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Greek alphabet
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).

Use:

Capital φ is used for:

Physical magnetic flux

Electrical indicates whether the power supply is single-phase or three-phase, for example: 1 φ, 3 φ.

Symbols are used to:

Physical fluctuation stage

Phase of current and voltage

Potential in electrostatics

Symbol of the golden section

Mathematically, the independent variable of a complex number.

The angle between a straight line and the z axis in three-dimensional coordinates.

The ultimate function of rulers

φ bond, a theoretical chemical bond

Short for 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 to:

In engineering, the diameter of the module?

Mathematically represents an empty set.