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.