Nota bene (//; plural form notate bene) is an Italian and Latin phrase meaning "note well". The phrase first appeared in writing circa 1721.
Often abbreviated as "N.B.", "N.b." or "n.b.", nota bene comes from the Latin roots notāre ("to note") and bene ("well"). It is in the singular imperative mood, instructing one individual to note well the matter at hand. In present-day English, it is used, particularly in legal papers, 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". While "N.B." is often used in academic writing, "note" is a common substitute.