There are lots of abbreviations like that. Specially when on Nintendo side of things. AC - Assassin's Creed or Animal Crossing. MK - Mario Kart and Mortal Kombat. A general one is DS - Dark Souls and Death Stranding.

Some of these might just be me. For instance Dark Souls and Death Stranding both are on my list to play soon, so I mention it with friends and we use DS for both of them, so can be confusing sometimes.

I guess it depends on the communities you frequent.