I hovered over the number, and it took me a few moments to realize what the tooltip was saying (still not sure I really understand it). The wording could be better. I believe it was saying:
You answered x questions in this tag, and received total rep of y from those answers.
The non-wiki thing would be indecipherable to a newcomer. There's a lot of moving parts in the sentences. Score is ambiguous; is that upvotes or reputation? Hard to believe I've averaged less than two rep on each answer in the C# tag.