Wikipedia
A reimiro is a decorative crescent-shaped pectoral ornament once worn by the women of Easter Island. The name comes from the Rapanui rei ' stern' or ' prow' and miro 'boat'. Thus the crescent represents a Polynesian canoe.
Each side of the reimiro ended in a human head. The outer, display side had two small pierced bumps through which a cord was strung for hanging it. The inner side contained a cavity that was filled with chalk made from powdered seashells.
A reimiro provides the image of the Flag of Rapa Nui (Easter Island). It also appears to feature in the rongorongo script of Easter Island (as glyph 07: ), and one reimiro is preserved with a long rongorongo text.
Although the human heads on the reimiro are unique to Easter Island, the pectoral itself is part of a wider tradition. In the Solomon Islands, for example, women wear shell pectorals which resemble reimiro.