In a key signature, one flat is the note B flat.
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One flat in the key signature indicates that the music is in the key of F major or D minor.
To determine the key signature flats in a musical piece, look at the last flat listed in the key signature. This flat indicates the key of the piece. For example, if the key signature has one flat (Bb), the piece is in the key of F major.
Assuming the key signature has only one flat (B Flat) then the key is either F Major, or D minor.
The key signature of the F flat major key has six flats: B flat, E flat, A flat, D flat, G flat, and C flat.
The key signature that has B flat, A flat, E flat and D flat is Concert A flat Major.