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My understanding is that u3 is what is typically reported, but that u6 is a more full picture (it includes people who are working age but discouraged and withdrawn from the workforce).
U3 (the official unemployment rate) excludes people who have been unemployed too long, that is "stale" or "discouraged workers".
Are you referring to [this][1]? If so, which notion(s) of unemployment do you think are meant in the article?