"Trust level 3"?

Continuing the discussion from Why did Sweden switch from SPAV to Party List?:

This is the first I have heard about this “trust level” thing. What is that about?

With regard to trust level 3 users being able to edit any post’s title, it seems like at most a trust level 3 user should be able to suggest an edit or “censor” the title until a moderator makes a decision on it.

It’s a feature of Discourse - the forum software we use. It enables more self-moderation of a community rather than it being a heavy load for one or two admins. It gives rewards to people to are actively engaged with the community automatically.