Harpago is a genus of sea snails, marine gastropod mollusks in the family Strombidae, the true conchs. Harpago (`grappling iron`) is also a term used in insect morphology for the distal end of a genital clasper. Species within the genus Harpago include: ...
Harpoon.
A harpoon. 
harpago A portion of the clasper on the copulatory organ of certain male insects.