The title says it all really.
I suspect someone tried to create a tag
[list<t>] but the brackets got stripped out and he got listt instead.
Can the tag be renamed (generic-list perhaps?) or should it just be removed?
I've gone through and removed the listt tag from the questions it was on, and replaced them all with generic-list. I didn't create a synonym, since it was only 38 questions, so it didn't seem to be systemic enough to warrant one.