
I was calculating
the random MOTION
The Big Bang Theory Season 5, Episode 23

It stands for Perpetual Motion Squad.
The Big Bang Theory Season 1, Episode 13

How about the Perpetual Motion Squad?
The Big Bang Theory Season 1, Episode 13

to activate the MOTION sensor.
The Big Bang Theory Season 5, Episode 2

Now, inside we've got MOTION detectors,
infrared sensors...
The Big Bang Theory Season 3, Episode 13