Quote from "The Nashville Number System" by Chas Williams

"One more thing, though we know that B# and C are the same note, correct alphabetical spelling of th A major scale dictates that the #2 must be a B#. Since there is no B# in the chromatic scale, for simplicity, in the key of A, call C the b3. Adhering to the same spelling rule, the #6 in A should be F## (F double sharp, also written Fx). F## is the same note a G, so we'll use G as the b7 in the key of A, instead of F## as the #6."

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