What does the word "convention" connote in the context of the Convention badge?
The description of "10 posts with a score of 2 on meta" is unambiguous, but the choice of name isn't clear to me.
Well if you look at the definition of convention:
It's basically describing the community. Posting things on meta is a way of contributing your ideas to the community, such as debating a topic, or whatever the case may be. By receiving 2 upvotes on 10 of your posts, you're also showing a sense of agreement among the community.
Similarly, check the definition of quorum:
I think this one makes less sense than that of Convention...