This brass Tai Chi Eight Trigrams token, with noon-time talismans and imperial orders, is a traditional Taoist item. It's often used as a peace amulet, made into keychains or pendants.

The token is the main part. The Eight Trigrams (from I Ching) represent natural phenomena's states, while Tai Chi is the origin of all things. Together, they symbolize how the world works. Traditionally, it's thought to ward off evil.