It was actually just a MECHANICAL hand.
The Big Bang Theory Season 8, Episode 20
with elementary quantum
MECHANICAL formalism
The Big Bang Theory Season 12, Episode 5
But if you really want to learn
the MECHANICAL side,
The Big Bang Theory Season 10, Episode 15
Any chance you've finished up
those MECHANICAL drawings?
The Big Bang Theory Season 11, Episode 16
whether the accident was due
to MECHANICAL failure or distraction."
Money Heist Season 1, Episode 12