The SI symbol for flux is
Φ (Greek letter phi). It is used to represent various types of flux, such as magnetic flux, electric flux, and more. The unit for flux depends on the type of flux being measured, but for example:
- Magnetic flux: The unit is the weber (Wb).
- Electric flux: The unit is the volt-meter (V·m).
Flux generally refers to the amount of a field passing through a given area.