Origins of ⌚ U+231A WATCH and ⌛ U+231B HOURGLASS

[Prof. Pauluk]

Olá a todos,

I am trying to do some kind of "provenance history" of a series of
proleptic emoji, and I am stuck with these two here: ⌚ U+231A WATCH and ⌛
U+231B HOURGLASS.

While, for example, ⌫ U+232B ERASE TO THE LEFT and ⌨ U+2328 KEYBOARD could
be easily seen as motivated by the symbols 2023
<https://www.iso.org/obp/ui#iso:grs:7000:2023> BACKWARD ERASE and 5991
<https://www.iso.org/obp/ui#iec:grs:60417:5991> KEYBOARD from ISO7000/
IEC60417 Graphical Symbols for Use on Equipment, it is difficult to
see ⌚ U+231A WATCH and ⌛ U+231B HOURGLASS being originated from, let's say,
5184 <https://www.iso.org/obp/ui#iec:grs:60417:5184> CLOCK and 1366
<https://www.iso.org/obp/ui#iso:grs:7000:1366> ELAPSED OPERATING HOURS from
the same standard. I am well acquainted with ISO/TC145 Graphical Symbols
collection of signs, and I am almost sure that those two symbols didn't
come from any technical standard from ISO or IEC.

Does anyone remember why these two Miscellaneous Technical Symbols were
added, back then in the 1990s? Could it be because of Xerox Star/ Apple
Lisa's HOURGLASS and Susan Kare's WRISTWATCH icon for the 1984 Macintosh?

Regards,
Marcel Pauluk
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