"Ramsay says he promised himself that the minute he finished an Ironman, he would get a tattoo. “My daughters are going to think I’m über-cool,” he says. He plans to get a discreet “IM” on the back of his ankle. "

https://vegas.eater.com/2013/9/10/6373721/gordon-ramsay-on-competing-in-an-ironman-the-tattoo-he-will-get-and

Looks like he has a hidden one