red, yellow, orange, green, blue, brown, black
892,117,920
None. Red belts do not exist.there is a orange belt, but not a red one.
They show ascending levels of proficiency.
Grey is not used in belt colors for judo rankings.
There are various colors but I am aware that Green on the outside and Yellow on the inside is traditional.
green black and red
Originally there were no colored belts. That system is relatively new, less than 100 years. The karate-ka borrowed the system of Judo, which was light blue, white, brown, black, red and white and red. Each school, style and organization have developed their own systems and they vary a great deal.
No, unless you haven't made it to the top of your mon. If you have you stay at that belt. If you dont you go down 1 belt.
Kyu(brow belt and belwo) or dan (for black belts). Each has a different number depending on their grade. For example, brown belt is 1st Kyu, white belt is 6th.
The belt colors in least to greatest are: white yellow orange green blue purple brown black
White, Red, Yellow, Orange, Green, Blue, Brown, Black and (if passed Dans) Red and White
Depends on what style, because many wushu styles do not even have belts