Experience - Earned though attacks, missions, drop offs, mission objectives,
Reputation - Points achieved from doing drop offs, pick ups, missions, kills, daily safehouse collection.
Money - In game currency.
R2 - Red Robot Labs' game currency. Can be used for gear, cash and boosts.
Health - Health for attacking and being attacked. When dead use a health pack, pay for hospital, or you can wait for it to go back up.
Energy - Used for doing missions, or for drop offs
Stamina - Used for attacking
Mob - Friend list. Helped with attacks in the past - but not any more. One of the biggest advantages of having a large mob is you are more likely to receive gifts (and send them back). More free energy drinks = faster XP.