Amenonuhoko

Ame-no-nuhoko (天沼矛 or 天之瓊矛 or 天瓊戈, "heavenly jewelled spear") is the name given to the naginata in Japanese mythology used to raise the primordial land-mass, Onōgoro-shima, from the sea. According to the Kojiki, the gods Izanagi and Izanami were responsible for creating the first land. To help them do this, they were given a naginata decorated with jewels, named Ame-no-nuboko. The two deities then went to the bridge between heaven and earth, Ame-no-ukihashi ("floating bridge of heaven"), and churned the sea below with the naginata. When drops of salty water fell from the tip, they formed into the first island, Onōgoro-shima. Izanagi and Izanami then descended from the bridge of heaven and made their home on the island.

The kanji used in Ame-no-nuboko properly spell ame-(no)-numa-hoko, with numa meaning "swamp, marsh, or bog". This would translate as "heavenly swamp spear".