Wilk has noted a personal affinity with the number three throughout his life, and has positioned small decal stickers of the number "3" all over his drum kit, as well as in the liner notes for Rage Against the Machine's third album, "The Battle of Los Angeles". In an interview with Modern Drummer Wilk said "Ever since I was eight or nine I've gravitated to the number three. It's something that has always been a really heavy number for me. It's tattooed on my arm, and I count in threes. Everyone in school was taught two, four, six, eight, ten- I'd count in threes in the way I'd walk, even in the decisions I'd make. It was all based on threes", and also incorporates 3 into his playing.