Greek-Symbol Theta on Stainless-Steel Nut

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I am trying to understand everything I can about some stainless-steel nuts that I have come across. I have already researched and found information on the characters at the bottom of each nut, but I cannot find information on the symbol that looks like Theta at the top. So, my question is,

What does the ~Theta symbol mean on these stainless-steel nuts?

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Best Answer

I'd have to guess it's the manufacturers' logo.

In addition to the indicated grade marking, all grades, except A563 grades O, A and B, must be marked for manufacturer identification. –americanfastener.com

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