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In page Grammatical person:
"The term fourth person is also sometimes used for the category of indefinite or generic referents, which work like one in English phrases such as "one should be prepared" or people in people say that..., when the grammar treats them differently from ordinary third-person forms.[citation needed] The so-called "zero person"[3][4] in Finnish and related languages, in addition to passive voice, may serve to leave the subject-referent open. Zero person subjects are sometimes translated as "one", although in tone it is similar to English's generic you "Ei saa koskettaa" ("Not allowed to touch", "You should not touch").