Rongorongo ( /ˈrɒŋɡoʊˈrɒŋɡoʊ/; Rapa Nui: [ˈɾoŋoˈɾoŋo]) is a system of glyphs discovered in the 19th century on Easter Island that appears to be writing or proto-writing. Numerous attempts at decipherment have been made, none successfully. Although some calendrical and what might prove to be genealogical information has been identified, not even these glyphs can actually be read. If rongorongo does prove to be writing, it could be one of as few as three or four independent inventions of writing in human history.

Jacques Guy has an interest in the subject.

More details, including images, on the English [1] and Spanish [2] Wikipedia pages The article on its decipherment is at [3].

Further material can be found at [4] and elsewhere.