The X on your hand
http://www.straight-edge.net/skins/B...g/sxe_net2.jpg
Straight edge is a promise to yourself against Drugs, Alcohol, Premarital Sex and Smoking. They use the X to identify each other. Normally Emo kids and Scenesters do it. Some other people also believe that you have to be vegetarien or vegan as well, this isn't the case though... any ways You obviously your not..