A prefix would help to differentiate tag-specific badges from the others (like
Also it would help with the fact that they are a little bit inconsistent because they can (contrary to the others) start with a lowercase letter.
They could be something like:
Master: python (gold badge, 1000x upvotes)
Expert: python (silver badge, 400x upvotes)
('master' and 'expert' may not be the clearest distinction, suggestions welcome !)