Dudes, can someone please explain to me what the hell I'm supposed to understand about "MBB" meaning Men's Baseball or Basketball?

I just wasted a lot of time looking up when the hell we played Notre Dame in MBB and then realized, "Oh, maybe they don't mean Baseball, maybe they mean Basketball."

Someone, please tell me how I should be able to differentiate.

God Bless and Gig 'em.