
Easy. 40 weeks from the date
of her last PERIOD.
The Big Bang Theory Season 11, Episode 16

Well, maybe my male cycle
synced up with Raj's actual PERIOD.
The Big Bang Theory Season 9, Episode 21

Period.
Breaking Bad Season 3, Episode 13

♪ Get the money, man ♪
♪ D/R Period ♪
Breaking Bad Season 4, Episode 2

We based this park
on Japan's Edo PERIOD
Westworld Season 2, Episode 5