# What symbol is used for the moon when doing calculations?

When doing calculations the mass and radius of the Earth can be represented by $$M_{\oplus}$$ and $$R_{\oplus}$$ respectively.

The planets all have their own symbols which can easily be found online.

But what about the Moon ?

Usually something like $$M_☽$$ is given but is that standard ? Are there other versions of expressing the moon ?

There is no authorative standard - you can use what you want, as long as it is clear what you mean. Besides that: yes, ☽ is reasonably standard. Often also written indices like $$M_{moon}$$ or $$M_m$$ are used.