Badge for mastering a whole subject/topic.

I would like a badge that symbolizes your completion of a certain subject, like astronomy or trigonometry. I know that you get separate badges for completing parts of the subject, but I would like one badge for mastering all of it. The badge could be called "Master of Trigonometry". This goes for all other subjects.

A example of what I'm talking about is the "JS: drawing & animation" and "Advanced JS: Natural simulations" badges... as well as the other 3 computer programming topics. I would like badges like that for math, that you can display in your display case.

What do you think?