Celtic Eternity Knot T-Shirt - Eternity Knot with the word Eternity in the center. The Celtic Knot is a traditional Celtic symbol found in ancient manuscripts and symbolic of eternity: trace any Celtic Knot and you will not find a beginning or an end. Each piece of Celtic Legends apparel includes a story card telling of the legend inspiring the design. Available in Small, Medium, Large, Extra Large, 2X and 3X. Printed in the USA on a Black 50 percent cotton and 50 percent polyester 5.6 ounce tee.