Talk:Rhino (Warframe)/@comment-110.159.134.174-20130916105108/@comment-49.147.47.212-20130916145021

That's a loadout. It means you can have different set-ups/layouts for your mods. There's three of them in total, so, A is your primary loadout, B 2nd, and C 3rd. Even the warframes' and weapons' appearance have their own loadouts.