Anno is a collective term for everything from power cells for your leaser pistol to Mini Nukes for your M.E.R.V. Edit
there are several types of ammo in the wasteland , for conventural guns (Ie. guns that shoot bullits) wepon smiths have created a veriety of ammo types from AP (armor pearcing) , to JR (junk rounds) and even HP (high power). Each type has its Ad's and Disad"s.