Hi Serge:


>       O = Out of Circuit
>       I = In Circuit
>   
>   Note: while many people believe the symbols are O & 1, they are in fact
>   O & I

IEC 60417 Symbols 5007 and 5008 are neither:

    the numbers 1 and 0, nor 
    the letters I and O.

They are the symbols depicted in the 60417 drawings,
specifically a vertical line and a circle.

My comment is that the ETYMOLOGY of the 5007 and 5008
symbols are the numbers one and zero.


Best regards,
Rich





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