Nota Bene is a Latin phrase meaning "Note Well," coming from notâre—to note. It is in the singular imperative mood, instructing one individual to note well the matter at hand. (The plural form is notate bene.)

In present day English, it is used to draw the attention of the reader to a certain (side) aspect or detail of the subject on hand, translating it as "pay attention" or "take notice". It is often written in the abbreviated form: N.B.