Glitter describes an assortment of small, colourful, reflective particles that comes in a variety of shapes and sizes. Glitter particles reflect light at different angles, causing the surface to sparkle or shimmer. Glitter is like confetti, sparkles, or sequins, but somewhat smaller. Since prehistoric times, glitter has been made and used as decoration, from many different materials including stones such as malachite, galena, and mica, as well as insects and glass. Modern glitter is usually manufactured from plastic.

https://en.wikipedia.org/wiki/Glitter