Without defending the misleading way this was used, there are such things as 1. Known knowns, 2. known unknowns, and 2. unknown unknowns. AKA stuff you know, st

Without defending the misleading way this was used, there are such things as 1. Known knowns, 2. known unknowns, and 2. unknown unknowns. AKA stuff you know, stuff you know that you don't know, and stuff that you do not know that you don't know.