There's info here: https://www.facebook.com/business/help/167836590566506?id=288...

There's info here:

But that doesn't fully capture it. They also have definitions of social issues, which is a subset of this shorthand of political ads:

Here's how those ads are reviewed:

If you go into the United States at that last link, you can see further definitions by issue. So, civil rights, or education, or guns.