Looking for some help. I am reviewing a print and I see a new symbol, or at least new one for me, that I would like your help with. It is a large Z with smaller numbers in the upper left and lower right.

Can some one tell me what it is. There are  several on the drawings.

Thank you
Scott B. Westheimer
5709 Clarks Fork Drive
Raleigh, N.C. 27616
Phone: (919)713-0748
Office: (919)713-4258
Cell: (919)961-5364

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