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Re:Emojis paved the way for UTF-8 everywhere by derefr on Tuesday November 17, 2020 @03:06PM (#25128980)
And the etymology of this being that Dungeons and Dragons has a "Prime Material Plane" and an "Astral Plane", where the Astral Plane connects the PMP to various "Outer Planes" made of ridiculous not-oft-encountered stuff.

But whoever came up with this cute analogy got the analogy wrong — the higher Unicode planes are analogous to the "outer planes" themselves; while the "astral plane" would be some sort of glue allowing you to access these outer planes from within the BMP. Like... surrogate-pair characters! One could nickname the reserved surrogate-pair range in the BMP, the "astral projection" range ;)

Re:Emojis paved the way for UTF-8 everywhere by kens on Tuesday November 17, 2020 @03:29PM (#25129372)
"Astral plane" predates Dungeons and Dragons by centuries. Looking at old discussions, I couldn't find any evidence that Unicode's usage is connected with D&D.

Early discussion of "astral character" or "astral plane" for the Unicode supplementary planes at: https://unicode.org/mail-arch/unicode-ml/Archives-Old/UML024... Even earlier 1998 use: https://www.unicode.org/L2/L1998/98354.pdf

Re:Emojis paved the way for UTF-8 everywhere by Sniffnoy on Tuesday November 17, 2020 @03:17PM (#25129187)
The term "astral plane" is older than D&D, and I would assume they took it from the more general usage, not the specific usage in D&D. https://en.wikipedia.org/wiki/Astral_plane
Re:Emojis paved the way for UTF-8 everywhere by GauntletWizard on Tuesday November 17, 2020 @06:20PM (#25131229)
I’ve met several of the Unicode standard committee - They’re nerds. The kind of nerds for whom “Astral Plane” is a multilayered joke. It’s not not about the general usage, but nor is it not about the D&D term.