Harpoon

A harpoon is a long spear-like instrument used in fishing to catch fish or large marine mammals such as whales. It accomplishes this task by impaling the target animal, allowing the fishermen to use a rope or chain attached to the butt of the projectile to catch the animal. A harpoon can also be used as a weapon.

In the shinobi world, ninjas usually use harpoons to capture the summons of its enemies during battle. More commonly the harpoons are used in battles in the water, where many times fish, sharks, piranhas or whales are summoned.