They are Combine Points, an OOC reward to get some IC entities. You should see a CP number under your avatar, just below your HP/XP bars. Click this number and it will take you to the voting page. Best thing to do is every day click the vote buttons on the left side. You can try the rewards listed on the right, but they tend to not reward consistently, or throw viruses your way.
To use them, from the page mentioned earlier there is a link called [Exchange CPs] which allows you to get custom images for your stuff, make some custom items/NPCs, and to spawn ships/vehicles/droids. There are various rules on what will be accepted, and where to get them, and they will be listed in the relevant sections there.