B-26 by Ezra Fitz
B-26 is a significant number in the relationship between Ezra Fitz and Aria Montgomery. It refers to the song playing on the jukebox when they first met. During Season 1, Ezra publishes a poem entitled B-26 written about Aria. "A" puts a copy of the poem in Aria's locker in '"Keep Your Friends Close," prompting her to eventually get back together with Ezra.
In Season 4 episode 20, "Free Fall," we see B-26 being used as the password to the security system which is installed at Ezra's cabin.
B-26 by Ezra Fitz
It's a number.
It's a song.
It's a girl.
Smooth.
Pearl Joy packed.
Gold Falafel,
As through ice.
It's four thirty.
Morning with
Phone calls.
It's deaf mute.
It's cheap.
A foreign car.
Maybe bingo.
Lucky night?
Something says
It smells bad.