You learned LEDs! (Light-emitting diodes)... Adafruit offers a fun and exciting stickers to celebrate achievement for electronics, science and engineering. We believe everyone should be able to be rewarded for learning a useful skill, a sticker is just one of the many ways to show and share.This is the "I made something with LEDs!" sticker for use with educators, classrooms, workshops, Maker Faires, TechShops,