Code name for the D-Day invasion, June 6, 1944.
Operational code name for Allied operations in Normandy and North West Europe, beginning with Operation Neptune on D-Day, 6th June 1944.
Overlord (called Supremacy: Your Will Be Done in Europe) was a computer game designed by David Perry & Nick Bruty and produced by Probe Software for the Amiga and Commodore 64 computers in 1990. It came on two disks.
Overlord is an NES war game where the player can go to up to four different galaxies, fight evil aliens in their spaceships, and eventually conquer their starbase so that the humans can colonize the entire universe. This game is similar to Sim Earth except currency is used instead of natural planet energy and wars are manually controlled by the player, instead of being waged out automatically by the CPU.
Overlord is a 1975 film by Stuart Cooper. Set around the D-Day invasion ('Operation Overlord'), it's a war film about a young soldier's meditations on being part of the war machinery, and his premonitions of death.