The level of all belts is different between each form, and even amoung the sub forms of each type of martial arts.

As for the TaeKwonDo I take currently, it's white, yellow, orange, blue, green, purple, brown, red, dark blue, stripe, black belt for thier order. But every form is different, some forms even have thier own belts (like stripe for my form and dark blue, those 2 generally aren't in other forms.)