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  • Especially in engineering, something, such as a problem, that has not been and could not have been imagined or anticipated; an unknown unknown. (From Double-Tongued Dictionay)

    June 9, 2008

  • Typically referred to in engineering settings as the "Proverbial unknown-unknown".

    June 10, 2008

  • I'll be saying this all day. Yarb did it to me.

    October 2, 2008