Pleonasm
Pleonasm (/ˈpliː.əˌnæzəm/; from Ancient Greek πλεονασμός pleonasmós, from πλέον pléon 'to be in excess') is redundancy in linguistic expression, such as "black darkness", "burning fire", "the man he said", or "vibrating with motion". It is a manifestation of tautology by traditional rhetorical criteria. Pleonasm may also be used for emphasis, or because the phrase has become established in a certain form. Tautology and pleonasm are not consistently differentiated in literature.