What is L0?

L0 definition and meaning on Science terms:
A representation of the luminosity of an object in terms of Solar luminosity. The average luminosity of the Sun is about 4×1033 erg/sec. Astronomers often express units for other objects in terms of solar units, which makes the resulting numbers smaller and easier to deal with.


reference: https://imagine.gsfc.nasa.gov/resources/dictionary.html