There has been a discussion about it on the comments of this answer but that is another question.
I think that this tag (edge) is used for several case, such as mentioning a computer model, network service, or Ubuntu Edge. But it is not specified in the tag summary at all.
I'm a bit tired of review edits adding and removing this tag and I don't know what to do.
Should we create a synonym to ubuntu-edge or delete this tag? Another suggestion?