Why is the C in Mc small?

Why is the C in Mc small? This is preserved in the symbol № for “number”. Writing Mc as MC therefore preserves the original, “true” form of the name in a way that Mc does not (as it does not indicate the abbreviation).

This is preserved in the symbol № for “number”. Writing Mc as MC therefore preserves the original, “true” form of the name in a way that Mc does not (as it does not indicate the abbreviation).
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