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In scenario foresight, things we do not know that we do not know.
Reference#Famous quote by Donald Rumsfeld, United States Secretary of Defense, when talking about weapons of mass destruction during a press conference at NATO Headquarters in Brussels, in February 2002: “There are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns – there are things we do not know we don't know.”
- Norris, C.: Staying for an answer. Truth, knowledge, and the Rumsfeld creed, in: Philosophy and Social Criticism, vol. 30, no. 7 (2004): 777-798.