Hypnotic Spiral Swirl, Archimedean Fermat. Flat Vector Icon illustration. Simple black symbol on white background. Spiral Swirl, Archimedean Fermat sign design template for web and mobile UI element. Hypnotic Spiral Swirl, Archimedean Fermat. Flat Vector Icon illustration. Simple black symbol on white background. Spiral Swirl, Archimedean Fermat sign design template for web and mobile UI element.