The "D" in D-Day can mean anything you want it to mean. It's a military planning code term which indicates the proposed date for the advent of a military campaign or operation. It's attributed to a member of Patton's staff during the landings in North Africa who later transferred to Eisenhower's staff. D-Day in North Africa was 8 November 1942; in Southern France 15 August 1944; at Iwo Jima 19 February 1945; at Okinawa 1 April 1945; at Inchon (during the Korean War) 15 September 1950 and so forth. The Normandy Invasion is most widely- and readily-recognized simply because it's the most famous D-Day. Operations immediately following a D-Day are referred to as "D-Day plus One" or, simply, "D plus One" (the day after D-Day), "D plus Two" (two days after D-Day), etc. In the Pacific, the term "L-Day" was used synonymously (L-Day at Okinawa was termed "Love Day" because of the almost total absence of enemy resistance).