A "terp pearl" or "terp ball" is a small, spherical object typically made of heat-resistant materials like quartz, ceramic, or titanium. It is used in conjunction with a dab rig or a vaporizer for consuming concentrates, such as wax, shatter, or oil.
When a terp pearl is placed inside a heated banger or nail, it helps to distribute and retain heat more evenly. The pearl spins or rolls around as the user inhales, creating a swirling motion that helps vaporize the concentrate more efficiently.