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The circle of fifths text table shows the number of flats or sharps in each of the diatonic musical scales and keys. Both C major and A minor keys have no flats or sharps.
In the table, minor keys are written with lowercase letters, for brevity. However, in common guitar tabs notation, a minor key is designated with a lowercase "m". For example, A-minor is "Am" and D-sharp minor is "D♯m").
The small interval between equivalent notes, such as F-sharp and G-flat, is the Pythagorean comma. Minor scales start with 
, major scales start with 
.