This is a Harry Potter Hogwarts Crest enamel pin. It features the crest of the Hogwarts School of Witchcraft and Wizardry, representing all four houses: Gryffindor, Ravenclaw, Slytherin, and Hufflepuff. The pin is often officially licensed merchandise from the Harry Potter franchise. It typically has a gold-plated finish with hard enamel fill and black detailing. The Latin motto on the banner reads "Draco Dormiens Nunquam Titillandus," which translates to "Never Tickle a Sleeping Dragon".
