The Egyptian god Ra was an important deity in the Egyptian pantheon. Primarily he was a sun god, hence the sun-disk iconography represented here. As his importance grew, he was associated with all aspects of the created world; the sun, the sky and the Earth. Portrayed as a falcon-headed god, he bore similarities with Horus. The worship of Ra was often combined with other similar gods, who had similar attributes such as Ra-Horakhty and Amun-Ra.
To find out more about Ancient Egyptian amulets please see our relevant blog post: Egyptian Amulets and their Meanings.