Mine is OOO for Out Of Office. I always misread it in my head like a ghost and it takes me a few seconds to process. It also doesn't translate to speech—you have to say the whole thing.
Interested to see if others have similar acronyms they beef with.
Someone at work insisted the MVP emoji meant Minimum Viable Product. I get that the term exists, and that we use it, but it's way more niche than Most Valuable Player, and it's certainly no emoji.