Avoiuli (from Raga avoi "talk about" and uli "draw" or "paint") is a writing system used by the Turaga indigenous movement on Pentecost Island in Vanuatu. It was devised by Chief Viraleo Boborenvanua over a 14-year period, based on designs found in traditional sand drawings, and intended as a native alternative to the Western alphabet.
The script can be written either left-to-right or right-to-left (with the letter shapes reversed, though the majority are symmetrical anyway). A few texts in Avoiuli are in boustrophedon style, with alternating lines of left-to-right and right-to-left writing. Capital letters in Avoiuli are similar to lowercase but are enlarged and drawn around a + shaped 'frame', a feature also seen in traditional sand drawings. Capital letters are not used much in everyday writing.
Scholars learn to write in Avoiuli at Turaga's traditional school at Lavatmanggemu in north-eastern Pentecost, and at affiliated 'custom schools', paying substantial school fees for the privilege. Avoiuli is also used in record-keeping by the Tangbunia indigenous bank.