benchmark standard barometer yardstick bar criterion measure guideline indicator mark metric model precedent grade guide reference test example gage gauge norm check exemplar hallmark par pattern indication basis rule archetype paradigm specification ideal prototype convention formula canon scale principle index sample baseline average blueprint type meter metre signal clue target level marker design law precept optimum template control mean original median paragon perfection lodestar referral proof measurement method inspiration master tenet standards morality ethics principles morals ethos sign ordeal diagnostic pointer hint medium custom foundation assize maxim framework warning omen mould display beacon symbol stereotype bellwether version style archetypal classic