There isn't a third. There are two, T (made up of one district) and X (made of two).
If the point of this project was to call attention to ridiculously-shaped gerrymandered districts, these are some of the last districts that should ever be considered for inclusion.
Be that as it may, it substantially undermines the premise of the work, which is presumably, "Gerrymandering is so rampant that you can make an entire alphabetic font out of gerrymandered districts".