Sequins are disk-shaped beads used for decorative purposes. In earlier centuries, they were made from shiny metals. Today, sequins are most often made from plastic. They are available in a wide variety of colors and geometrical shapes. Sequins are commonly used on clothing, jewelry, bags, shoes and many other accessories.

Carlo Heinrich Séquin (born October 30, 1941) is a professor of Computer Science  at the University of California, Berkeley in the USA.