You can have many different ratings on the ICC. There are ratings for bullet, blitz, standard, 1-minute, 3-minute, 5-minute, 15-minute, 45-minute which are different speeds of regular chess. There are ratings for bughouse, loser's, wild, checkers and chess960 which are for chess variants. See "help definitions" for an explanation of what these mean.
How do I see my ratings?
ICC for Mac/Windows interface: On the left, above the option for 'links', you can find your username. Click on your username.
To view someone else his profile/ratings you can click on the icon in the top right corner named 'Lookup user'.
If these icons are not showing you can make them reappear by clicking on the option for 'Lobby' in the list on the left under 'LINKS'.
For more information read "help ratings"