Uni-the-Unicorn!
Hero
There has been some discussion on these boards recently (Do we need a Fifth Edition Revival, Don't Throw 5e Away Because of Hasbro, Using "D&D 2024" instead of "5e24") about separating WotC D&D 5e from the greater 5e universe of games. @DEFCON 1 had the best idea (IMO) that we need a completely different name for non-D&D 5e based games like 3e games had the "d20" system identifier. So I nominate:
5d20
Who's with me?
5d20
Who's with me?