That is C Minor
That is the signature for the key of Db. Or, it's relative minor, Bb minor.
The key signature of the C minor scale has three flats: B flat, E flat, and A flat.
Assuming the key signature has only one flat (B Flat) then the key is either F Major, or D minor.
The key signature with only a B-flat is either F major or D minor.
The key signature for F major has one flat (B flat) , while the key signature for F minor has four flats (B flat, E flat, A flat, and D flat).
well the minor scale was unfortunait used to be b flat then it was changed to e flat.
Only "B flat" is the key signature, then "C sharp" is the accidental.
D minor - more specifically, D harmonic minor (the version of the minor scale with a flat 6 and a sharp 7). However, you will never see a key signature with a B flat and a C sharp. The key signature will only contain B flat.
F major, or D minor. The flat is b flat.
F Major...or D Minor
F# minor, which has 3 sharps in the key signature.
D major has a key signature of F sharp and C sharp D minor has a key signature of B flat