Originally Posted by Darvin
It's one of the things that the genre has failed to get a standardized term for. Population points or command points are common ones, but I've also heard supply and support before. In any case, all those terms refer to the maximum number of units a player can support on the battlefield.
The most standardized term is "pop" (for population). There are a few who don't use these terms, though. Like the BFME series (command points), Dawn of War and Company of Heroes.