@HerraBRE !GNUsocial calls it "mute" for the per-profile blocking, which makes the muted profile disappear from your feeds (while logged in of course). Or at least should, I think it's still buggy because it's not been such a big problem for me at least thanks to active moderators.

Then we have "silence" which is a moderator-level ban from the site in general. New posts are not received.