
This is a sub-sonic impact SENSOR.
The Big Bang Theory Season 1, Episode 11

...and the SENSOR apparatus will rest on it.
The Big Bang Theory Season 1, Episode 12

HOWARD:
Told you the SENSOR would work.
The Big Bang Theory Season 1, Episode 11

The seismic SENSOR isn't emitting
any signal now.
Money Heist Season 3, Episode 8

All right, you're close enough
to Sheldon's room. Deploy the SENSOR.
The Big Bang Theory Season 1, Episode 11