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

[Steve Allen]

On Tue 2019-03-05T21:27:31+0000 Clive D.W. Feather hath writ:
> Long ago I read somewhere that the 0, 1, 2, and later C were all
> subscripts. Is there any truth in that?

Documents from BIH and IAU which were typeset using subscripts for
other notations do not use subscripts for UTx.

--
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