What name was also the D-Day invasion password?

According to this site, as well as many trivia sites, 'Mickey Mouse' was the password used by U.S. forces on D-Day ('Operation Overlord' was the codeword for the entire operation, not really a password).
https://www.quizquizgo.com/question/61019-what-was-the-d-day-invasion-password

There is a myth that the password was "Mickey Mouse." Operation Overloard was not a mickey mouse project. In truth, the password was "Flash" and the countersign was "thunder." The troups were also issued brass cricket, a small toy that made a clicking sound when squeezed in order to recognize friendlies in the dark. One click was answered by two clicks.

http://www.nationalww2museum.org/learn/education/for-students/ww2-history/d-day-june-6-1944.html