
but when they're TWIN primes,
The Big Bang Theory Season 9, Episode 12

The Crown and the Faith
are the TWIN pillars of the world.
Game of Thrones Season 6, Episode 3

...since I beat out my TWIN sister
for the "Did It On The Potty" trophy.
The Big Bang Theory Season 8, Episode 23

Penny, this is Sheldon's TWIN sister.
Missy, this is our neighbor Penny.
The Big Bang Theory Season 1, Episode 15

She's my TWIN sister.
The Big Bang Theory Season 1, Episode 15