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Content notice: this site is about the history of warfare. Any page could contain descriptions of combat, death, injury, or psychological trauma.
None indicates that a property of page type has no value. This usually means that the property does not apply. It is not the same as unknown, which means that the property might apply in this case but the value is not known. If the property ought to have a value but it can't reasonably be known, use not found instead.
Examples of when to use None: