Local ordinances and acts apply on the island, where most laws are based on the Australian legal system. Australian common law applies when not covered by either Australian or Norfolk Island law. Suffrage is universal at age eighteen.As a territory of Australia, Norfolk Island does not have diplomatic representation abroad, or within the territory, and is also not a participant in any international organisations, other than sporting organisations. The flag is three vertical bands of green (hoist side), white, and green with a large green Norfolk Island pine tree centered in the slightly wider white band.