Maui's fish hook is an magical item that appears in Moana. It belongs to the demigod Maui.
The fish hook is a sizable bone-like weapon created by the gods of Polynesian lore. It was given to Maui after the gods adopted the former and turned him into a demigod with supernatural power. It had since been used throughout his exploits, and has considerable magical abilities. Like its owner, the fish hook has elaborate markings engraved on it, representing the various tales and adventures it has been used in. According to Maui, he used the fish hook to slow down the sun itself, pull islands out of the sea, and battle colossal monsters. Aside from being a weapon, Maui also uses the fish hook in his dances and performances, swinging it around himself as he does so.
The hook is notable in that it grants Maui the ability to shapeshift. The hook itself disappears into Maui's animal body whenever he does so, as its shape is seen on the wing of Maui's hawk form. Without the hook, however, Maui cannot perform this ability.
Thousands of years before the film, Maui lost this weapon after his theft of the heart of Te Fiti and his subsequent battle with the lava demon Te Kā. The fish hook was lost in sea, and eventually was found by Maui's arch-rival Tamatoa, who placed the fish hook on his shell as a prize.
In Polynesian folklore, the fish hook was fashioned from the jawbone of Maui's grandmother Muri-ranga-Whenua.
Many of the stories Maui mentioned using the fish hook in allude to the legends the mythological Maui was involved with.
There is a constellation named Manaiakalani, the name of the fish hook in Hawaiian versions of the Maui myth. This is alluded to in the film, as the hook has its own constellation which is said to direct where Maui is.