Flats are arranged in Blocks
block
Sharps and flats in music are called accidentals; this also includes naturals.
A large building divided into separate flats is called a tenement.
Eb Major and C Minor scales have 3 flats.
Rascal Flats
FLATS had nothing to do with what the women wore. It stood for First Lady Astronaut Trainees. The FLATs were a group of women who applied for astronaut training during the days of the Mercury space program. None of them were ever selected.
They are called "accidentals". This also includes naturals (which make a sharp or flat note in the key signature not sharp or flat for that measure).
C Major
c flat
I think it was called The Crust
In Britain apartments are called flats.