Giger's Necronom V: Upper figure's boat shaped body inspired by Easter Island Rei Miro sculpture

leading from
HR Giger's Necronom V (1976)

 Giger's Necronom V

a) 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. (http://www.wikiwand.com/en/Reimiro) 

Rei Miro http://www.musee-calvet.org/ 

b) 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.(http://www.wikiwand.com/en/Reimiro) 

Rei Miro  http://jorditournaturaicultura.cat

c) 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.(http://www.wikiwand.com/en/Reimiro) 

Rei Miro from the Bishop Museum

https://de.wikipedia.org/wiki/Rei-Miro

Rei Miro without faces (http://www.wikiwand.com/en/Reimiro)

Left head with crescent shaped body and ribcage

Right head pierced by the end of the body.