The Yokosuka MXY-7 Ohka (櫻花 (Shinjitai: 桜花) "cherry blossom" Hebon-shiki transcription Ōka) was a purpose-built, rocket powered human-guided anti-shipping kamikaze attack plane employed by Japan towards the end of World War II. United States sailors gave the aircraft the nickname Baka (Japanese for "fool" or "idiot").
The MXY-7 Navy Suicide Attacker Ohka was a manned flying bomb that was usually carried underneath a Mitsubishi G4M "Betty" Model 24J bomber to within range of its target; on release, the pilot would first glide towards the target and when close enough he would fire the Ohka's three solid-fuel rockets, one at a time or in unison, and fly the missile towards the ship that he intended to destroy. The Ohka was used mostly against American ships invading Okinawa, and it was extremely effective.
Source: Wikipedia, "Yokosuka MXY7 Ohka", available under the CC-BY-SA License.