The order of the key signatures – sharps

If one, and only one, sharp appears in the key signature, it is always an F sharp.

If two sharps appear in the key signature then it is always an F and a C sharp.

If three sharps appear in the key signature then it is always an F, C and G sharp.

If four sharps appear in the key signature then it is always an F, C, G and D sharp.

If five sharps appear in the key signature then it is always an F, C, G, D and A sharp.

If six sharps appear in the key signature then it is always F, C, G, D, A and E sharp.

If seven sharps appear in the key signature then it is always an F, C, G, D, A, E and B sharp.

The order of the sharps are always
F C G D A E B