See screenshot of tags on my profile at Super User:
What do the numbers on either side of the tag mean? e.g. 53 Windows-7
x 83
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Sign up to join this communitySee screenshot of tags on my profile at Super User:
What do the numbers on either side of the tag mean? e.g. 53 Windows-7
x 83
Right number is the number of questions+answers you've posted with the tag. Left number is your total vote count received on non-wiki answers to questions with those tags.
The number to the right should be self-explanatory, thanks to the ×. Tag times X = you have asked/answered X questions with that tag. The number to the left is more confusing, but that's why it is actually explained in great detail in a mouseover tooltip.