Fritz X
Fritz X was the most common name for a German guided anti-ship glide bomb used during World War II. "Fritz X" was the world's first precision guided weapon deployed in combat and the first to sink a ship in combat. "Fritz X" was a nickname used both by Allied and "Luftwaffe" personnel. Alternative names include Ruhrstahl SD 1400 X, Kramer X-1, PC 1400X or FX 1400 (the latter, along with the unguided PC 1400 "Fritz" nickname, is the origin for the name "Fritz X").