The term 'third person' is used to refer to a point of view in writing or speaking that does not involve the speaker or writer. In this context, the crossword solutions UMP (3 letters), THEY (4 letters), HE (2 letters), and CAIN (4 letters) all refer to third person pronouns. UMP is an informal pronoun used in some dialects of English to refer to a third person, THEY is a plural pronoun used to refer to a group of people, HE is a singular pronoun used to refer to a male individual, and CAIN is an archaic pronoun used to refer to a third person.