On ABZÛ we ripped out multiplayer and lots of other cruft from AActor and UPrimitiveComponent - dropping builtin overlap events, which are a kind of anti pattern anyway, not only saved RAM but cut a lot of ghost reads/writes.
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I wonder how that came to be used. It's a traditional way to distinguish eta and omega in transliteration from Greek, but it's not at all a traditional way to mark long vowels in general.
(I see that wikipedia says this about Akkadian:
> Long vowels are transliterated with a macron (ā, ē, ī, ū) or a circumflex (â, ê, î, û), the latter being used for long vowels arising from the contraction of vowels in hiatus.
But it seems odd for an independent root to contain a contracted double vowel. And the page "Abzu" has the circumflex on the Sumerian transliteration too.)
Perhaps a circumflex was easier to typeset, like with logicians switching from Ā to ¬A and the Chomskyan school in linguistics switching from X-bar and X-double-bar to X' and XP?