The Order of Cistercians ( /sɪˈstɜrʃⁱən/; O.Cist. Latin: Ordo Cisterciensis or, alternatively, O.C.S.O. for the Trappists (Order of Cistercians of the Strict Observance)) is a Catholic religious order of enclosed monks and nuns. They are sometimes also called the Bernardines or the White Monks, in reference to the colour of the habit, over which a black scapular is worn. The emphasis of Cistercian life is on manual labour and self-sufficiency, and many abbeys have traditionally supported themselves through activities such as agriculture and brewing ales.