Homeworld
Industrial 1, Industrial 2, Industrial 3 etc.
Research 1, Research 2, Research 3 etc.
Commerce 1, Commerce 2, Commerce 3 etc.
Culture 1, Culture 2, Culture 3 etc.
Diplomatic 1, Diplomatic 2, Diplomatic 3 etc.
- OR -
Alpha , Beta, Gamma, Delta
Usually like that, I know, boring but it helps keep track.