A tattoo on the back of his left hand reading "No gimmicks needed", a tribute to deceased wrestler Chris Candido.
A sleeve tattoo on his left arm that reads "luck is for losers", a mantra used on some of the choices for Punk's first ECW T-shirt,(dead link) that features numerous good luck symbols, including a rabbit's foot, four-leaf clover and a horseshoe. The tattoo also features four ace playing cards as a tribute to trainer Ace Steel.
A Pepsi logo on his left shoulder that inspired the names of two of his signature moves. It also became a symbol of Punk himself, who wore the logo on his ring gear in the independent circuit, as well as a slightly modified Pepsi logo being used as part of his TitanTron entrance video. He got the tattoo as a joke, as many fraternity members in his school were getting beer logos tattooed on their bodies. Punk, a keen Pepsi drinker, chose to receive a Pepsi tattoo to emphasize his straight edge beliefs. The tattoo is also a reference to former Minor Threat guitarist Brian Baker, who had a Coca-Cola tattoo and explained this by saying "I like Coca-Cola". When people inquire about Punk's Pepsi tattoo, he often replies "I like Pepsi" in a similar fashion.
The words "Straight Edge" are spelled out on Punk's stomach. This tattoo is one of his oldest tattoos, he has referred to it as his identity.
A common question about Punk's gimmick, and one that comes up often with fans, is the meaning of the initialism CM. Originally the CM represented the phrase "Chick Magnet", the name of the tag team he was in as a backyard wrestler. Punk, however, later changed CM into an orphan acronym, declaring that it has no meaning. Although Punk has stated CM now has no real meaning, when asked he has taken to making up meanings that fit the initials, going so far as to make up long stories to explain the origins that do not match the actual origin story at all. Since beginning this practice, Punk has stated CM stands for "Cookie Monster", "Cookie Master", "Crooked Moonsault", "Chuck Mosley", "Charles Montgomery", "Charles Manson", "Crazy Mariachi", "Chicago Made" and "Championship Material", among others.