What is the meaning of different colors of forum users?

[cola]

What is the meaning of different colors of forum users?
Like red for Administrator, is there any webpage where these are explained?

[confuseling]

Look at the bottom of the index (at least on the default forum skin)

index.php

[Debian4ever]

Look at the bottom of the index (at least on the default forum skin)

index.php

I do have to admit though that the colors do throw me off here as I am used to admins being either purple or red with mods being green or even blue on other forums.