Rongorongo is a system of writing native to Easter Island. It cannot be read. There are two dozen examples of rongorongo script, mostly carved on tablets made from wood of the portia tree Thespesia populnea, known as makoi in Rapanui (Easter Island) language. The longest inscription in existence is the Santiago Staff, a wooden sceptre 126 centimetres long and 6.5 centimetres wide, bearing 2300 glyphs (Gr. γλυφη "carving"). The staff, which once belonged to an Easter Island king, was acquired by the Chilean Navy in 1870 and is now in Santiago's Museum of Natural History.