Mayday is an emergency code word.

VOA: special.2010.04.18

Islamic leaders said the new code contains provisions that are an affront to the country's traditional values and religious beliefs.

VOA: standard.2009.08.27

They were tribal members who came up with an unbreakable code in their complex language that was adopted by American forces in the Pacific during World War II and used to confound the Japanese.

VOA: standard.2010.03.22