discovery.com with even more codes for us:
Discovered on Easter Island in the 19th century, Rongorongo is a text found only on fragments of wooden objects. It consists of glyphs resembling human, animal and plant figures as well as abstract, geometric symbols.
Dating the text has proven tricky, since researchers can only radiocarbon-date the wood, not necessarily the text itself. Evidence suggests, however, that the text couldn't date much further back than around 700 years ago.