Noun
rongorongo (uncountable)
An early glyphic writing system of Easter Island, written in reverse boustrophedon and as yet undeciphered. [from 20th c.]
He sent several pieces of genuine Rongorongo to his niece's husband, the German consul in Valparaíso, Chile. Source: Internet
Two Rei Miru at the British Museum are inscribed with Rongorongo. Source: Internet