What does ms stand for in Minecraft?

Answer 1

This "ms" is only used for your ping.

It stand for milliseconds.

Say if you where to have 100ms connection to a server that would mean that it takes 0.100 seconds to send information to the server and for it to return it.

Answer 2

Oh, dude, "MS" in minecraft stands for "Mob Spawner." It's like this magical thing that spawns mobs, you know, the creatures that try to ruin your day in the game. So, yeah, if you see "MS" in Minecraft, it's not talking about Microsoft, it's all about those pesky mobs.