Those are PRODUCTION markings.
The Big Bang Theory Season 3, Episode 17
Look,
we control PRODUCTION
and distribution.
Breaking Bad Season 2, Episode 5
Yeah, they say the yeast in beer
helps with milk PRODUCTION.
The Big Bang Theory Season 10, Episode 22
You're in a soup kitchen,
not a PRODUCTION of Oliver!
The Big Bang Theory Season 9, Episode 9
That's the one thing I'm certain of,
PRODUCTION cannot stop.
Breaking Bad Season 3, Episode 13