true position call out with the term boundary below it

I have seen this twice on new parts standard gdt true position call out with the term boundary below it.
can someone explain what boundary would refer to.
thanks

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Matthew D. Hoedeman over 10 years ago

http://www.tec-ease.com/gdt-tips-view.php?q=129
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Matthew D. Hoedeman over 10 years ago

http://www.tec-ease.com/gdt-tips-view.php?q=129
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