[tz] Why is `Etc/UCT` not an alias of `Etc/UTC`?

[Clive D.W. Feather]

Steve Allen said:
> At Dublin in 1955 the IAU decreed that everyone should use the same
> expressions and that all broadcasts should be the seasonally smoothed
> version.  In publications of the time service bureaus the three
> versions of UT acquired the names
> English UT0, UT1, UT2
> French  TU0, TU1, TU2
> both sets used with and without embedded full stop (.) characters.

Long ago I read somewhere that the 0, 1, 2, and later C were all
subscripts. Is there any truth in that?

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