The Hero/Heroine Formerly Known As; it's normally used to refer to a superhero/heroine who has changed their name for some reason (often a teen sidekick who's grown up, like the original Teen Titans. I decided to create this node since I seemed to be using this acronym in every other node I create. I suppose there's some sort of commentary there about me...
Please note that this acronym is not limited to young heroes who have grown up. The hero currently known as Sentinel (Alan Scott) is THFKA Green Lantern. This is also true for Guy Gardner, Warrior. Don't even get me started on Henry Pym over in the Marvel Comics....