There is a histfi shelf on Goodreads so I can’t claim that I’ve coined it. I have used it and will continue using it. Histfi, or hist-fi, falls into the same place as an abbreviation for historical fiction as sci-fi does for science fiction. It’s not used nearly as much but will be when the genre becomes as popular as sci-fi, which it could and should. Check the post about how the two genres are more similar than not.