So: is it because of the 12 tone scale that Unicode has exactly 12 Roman numerals? Or is it clock faces?
$B"!$8$e$&$$$C$A$c$s"!(B
?$B!V0&!W$O!V$"$$!W$G$9!#!V(B10^-10$B!W$b!V$"$$!W$G$9!#!h!V0&!W$O!V(B10^-10$B!W$G$9!#(B
?$B;d$O$m$3$($s$i$+$Y$5$G$9!#(B
?$B"v%i!<%a%s$O$$$$$G$9$h"v(B
This notation provides chord names that are independent
>of the current key, so that CEG is a I chord in the key of C, but a V chord
>in the key of F, while FEC is the I chord in F.
>
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