What does D-DAY stand for?

D-DAY stands for "Doom's Day"

How to abbreviate "Doom's Day"?

"Doom's Day" can be abbreviated as D-DAY

What is the meaning of D-DAY abbreviation?

The meaning of D-DAY abbreviation is "Doom's Day"

What does D-DAY mean?

D-DAY as abbreviation means "Doom's Day"