Harpoon nuclear missile

The Harpoon nuclear missile is a United Nations Space Command starship-mounted thermonuclear weapon. It is mentioned in a piece of concept art for the UNSC corvette Andraste that Isaac Hannaford designed for Halo 3, though it was not featured in the game.

Gallery
 File:H3 - FrigateOverview.png 

Trivia
It shares its name with a modern-day anti-ship missile.