grapnels
Multi-pronged throwing hooks
Grapnels are small anchors with multiple hooks or claws, used to grip surfaces or snag objects.
A grapnel can secure a small boat, or be thrown on a rope to catch hold of something—scaling a wall, dragging a riverbed, or boarding another vessel.
The hooked design lets it catch and hold where a conventional anchor wouldn't: They tossed a grapnel over the fence.