The logo for Super user, I interpret as a [ square bracket and a } curly bracket, with a · middle dot in between. [·}.

To keep that style, I noticed a place it could be added. When there is a new question, you get a little (1) in the tab.

I thought that instead of (1), it could be {1} or [1}. I don't know if this would look good (especially for larger numbers, like {117} or [117} but I thought it might be nice.