What do the different asset prefixes mean?

Trying to understand all the Assets in the Fortnite/ folder in a UEFN project to better sort them, so I know what I have available to work with.

Looking through the list of Assets, I see a few prefixes I don’t know: CP_, CRP_, CRG_. The ones names PROP_ or BP_ are obvious. Any idea what the prefixes CP_, CRP_ and CRG_ mean?