THIS IS A DRAFT!
There is offical wiki here: https://wiki.pine64.org/wiki/PinePhone_Pro.
PPP stands for PinePhone Pro.
PPPEE stands for PinePhone Pro Explorer Edition.
PPKB -- PinePhone KeyBoard.
OG PinePhone -- "Original Gangster" PinePhone (a precessor of PPP).
- Keep in mind that PPP Explorer Edition is for early adopters and developers -- don't expect things work out of the box.