three principles and five virtues (idiom); the three rules (ruler guides subject, father guides son and husband guides wife) and five constant virtues of Confucianism (benevolence 仁, righteousness 義|义, propriety 禮|礼, wisdom 智 and fidelity 信)
trad. 三綱五常
Also written 三綱五常【sān gāng wǔ cháng】