Game about a washed-up Space Marine, science babes and slimy aliens...and of course zombies! <...insert mutants if you hate zombies...>
These are some of the icons that will rock your inventory. Ammo is self explanatory but the mods probably need some explaining.
Blake can attach a mod to any weapon to give it awesome new abilities. For example an Acid mod will turn bullets into blobs of toxic melting goo that will burn through the toughest armor and melt alien flesh. Shock mods will give bullets electric discharge that will annihilate shields and stun monsters.
Piercing mods... Hell, those will just kick ass!