The HORSE format consists of alternating rounds of Hold'em, Omaha Hi/Lo, Razz, 7-card Stud and 7-card Stud Eights-or-better. One can't help but feel that the last couple of letters are somewhat forced. There's also HOSE, which is the same but without Razz.
Magic: The Gathering players have a mnemonic guideline for drafting. Put it all together and it spells BREAD:
Bombs — high efficiency, high effect. good enough to make you throw out any deck building concept you might have had beforehand.
Removal — cards that remove other cards.
Evasion — creatures that are hard to block (flying, shadow, etc.)
Packs have a special prefix put on each card to denote which set that card came from. They're taken from the first letters of the set's name, and will sometimes be used to spell out a word. For example, Clash of Rebellions becomes CORE.
Decks themselves have anagrams made by fans, though only a few are officially recognized. One of them is a deck mixed with Hands, Artifacts and Traptrix, which becomes H.A.T. and Shaddoll-Artifact-Traptrix becomes Sh.Ar.T.