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I have no clue - usualy it will be capital letter i or number 1.
I found only mentions about number of decimal places - aka in tenths ( 0,1mm ) but i am not sure.

I would ignore it 🤣
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That’s the symbol for the Independency Principle, which is odd, because in ISO it’s the default anyway. I’m not even sure if this symbol exists in ISO.

So basically it means: Don’t use the Rule #1 from ASME.
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