Enharmonic Key Signatures
Definition of enharmonic
Enharmonic is an adjective who means: having the same pitch in the tempered scale but written in different notation.
Notes, intervals, or key signatures can have their enharmonic equivalent.
For a key signature, an enharmonic key signature is a key signature that sounds the same as another key signature on a piano (tempered scale)
For example, G♭ Major scale and F♯ Major scale are enharmonic keys because they are being played with the same keys on a piano but their names are different:
G♭ Major scale
F♯ Major scale
List of enharmonic key signatures
Below is list of list of enharmonic key signatures:
C♯ Major (7#) and D♭ Major (5b)
F♯ Major (6#) and G♭ Major (6b)
B Major (5#) and C♭ Major (7b)
And below are some other scales who sound the same but without key signature: