Environment map is what the engine takes for displaying the reflections (reflecting the environment around the model). Different engines take different types of maps.
I'd just like to point out that pretty much all materials have gloss/shininess/exponent/roughness variance. Have an orange. edit: gloss only takes up one channel so you could fill the other two with whatever your engine/shaders supports. usually people go with glow, self illumination, alpha or separate AO.