If you have seen a whale harpoon, you would probably know how a harpoon blade looks. There are many types of pocket knives with a harpoon blade, but the main distinction is that harpoon blades have a hook-like barb or sharpened toggling claw that latches onto things. Most harpoon blades resemble a regular drop point blade, but a portion of its back is raised and sharpened. Other variations have obvious sharp barbs extending from the blade’s back, making the knife an excellent defensive tool against wild animals.