Hi Stephen:
> I think I missed the beginning of this thread, so
> please forgive me if I rehash old ground.
>
> The 'vertical line' and 'circle' you refer to, are
> actually a 1 ("One") and 0 ("Zero"); as in digital
> logic on/off respectively.
My original posting on this subject was with regard to
the ETYMOLOGY of the IEC 60417 symbols 5007 (a vertical
line) and 5008 (a circle).
The IEC 60417 symbols 5007 and 5008 are SYMBOLS. They
are NEITHER numbers NOR letters.
The ETYMOLOGY I quoted shows that these symbols were
originally the numbers zero for OFF and any number one
or greater for ON.
Best regards,
Rich
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