This bold black t-shirt features a white graphic of the Pi symbol being equated to "9.11," with a small airplane image above the left arm of the Pi symbol. The shirt's design has a mathematical yet controversial edge. It's perfect for individuals with a dark sense of humor or those who appreciate unique and thought-provoking statements in their clothing. Wear it casually or at social events for a conversation starter. The simple design is visually striking and will make a statement. Made from comfortable material, this tee combines style and comfort.