You know the Cullen family and their crest that is worn on all members of the clan, but do you know what it means?
"The Cullen crest depicts three images: hand (faith, sincerity), lion (strength, ferocity) and the trefoil (perpetuity). Jasper, Emmett and Edward wear this crest on wristbands, Rosalie on a necklace and Alice on a choker"
http://lubbockonline.com/filed-online/2012-11-15/facts-and-trivia-first-four-films-twilight-saga#.UswhIalpDs0