looks like an error with OCR or PDF conversion.

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Does the note in the lower left corner explain that?

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@IRstuff it doesn't

As a second guess, it's a parametric value that didn't get inserted into the drawing, so you need get the originator to look at their CAD file.

Note also, there's a third \U+22 at the lower right corner of the drawing.

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That seems familiar - perhaps it's a unicode character identifier. Still, the drawing is broken and needs to be fixed. I'm supposing this because "U+" is used as a unicode introducer, but something seems to be left out.

Would it mean CL sumbol? Just a guess.

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That looks like a unicode value that caused, or came after, an error.

The Unicode value U+0002 signifies "start of text", according to my googles.

I don't know enough about unicode to say anything about what went wrong or what it should be - all I know is that it's an error.

Perhaps the software is displaying Unicode values as a fallback because the font does not contain the necessary glyphs. I'd expect the diameter symbol to be the first character in those three tolerance value blocks, but that would be U+2300. The empty set symbol looks similar though, and it is U+2205, so perhaps it was used instead. The rest of the code, and presumably the actual tolerance values, would just be cut off due to the size of the space.

pylfrm

Thank you very much, people :)