Seven Card Razz

I know that the rest of the acronym is Holdem, Omaha, Razz, Stud and Seven-card, which is the other?

E stands for Eight or better, but at stud, Omaha not. the game of Omaha, HORSE is also eight or better, but the "O", not the letter "E".

"S" is for stud, hands only.

This is Omaha eight or better "at the bottom.

Omaha Eight or Better. It is a variant of Omaha with a split.