The letter X is the most known symbol of straight edge, and is sometimes worn as a marking on the back of both hands, though it can be displayed on other body parts as well. Some followers of straight edge have also incorporated the symbol into clothing and pins. According to a series of interviews by journalist Michael Azerrad, the straight edge X can be traced to the Teen Idles' brief U.S. West Coast tour in 1980.[39] The Teen Idles were scheduled to play at San Francisco's Mabuhay Gardens, but when the band arrived, club management discovered that the entire band was under the legal drinking age and therefore would be denied entry to the club. As a compromise, management marked each of the Idles' hands with a large black X as a warning to the club's staff not to serve alcohol to the band. Upon returning to Washington, D.C., the band suggested this same system to local clubs as a means to allow teenagers in to see musical performances without being served alcohol.[39] The Teen Idles released a record in 1980 called Minor Disturbance with the cover shot being two hands with black X's on the back.[40][3] The mark soon became associated with the Straight Edge lifestyle.[3]
Later bands have used the X symbol on album covers and other paraphernalia in a variety of ways. The cover of No Apologies by Judge shows two crossed gavels in the X symbol.[41] Other objects that have been used include shovels, baseball bats, and hockey sticks.[41]
A variation involving a trio of Xs, *advertiser censored*, is often used in show flyers and tattoos. This can be used to show that an adherent is extremely straight edge.[3] Also, it can be ironic based on the fact that three X's are a cartoon way to signify alcohol or poison.[42] The term is sometimes abbreviated by including an X with the abbreviation of the term "straight edge" to give sXe.[43] By analogy, hardcore punk is sometimes abbreviated to hXc. The X symbol can be used as a way to signify a band or person is straight edge, by adding an x to the front and back, for example, the band xDEATHSTARx