Armageddon was, according to various races and groups, the end of existence. The word was derived from a Bible passage.
In 2373, the Dominion attempted to destroy the Bajor sector, Deep Space 9 and several Federation, Romulan, and Klingon starships by igniting a trilithium, tekasite, and protomatter bomb in the Bajoran sun. After this attempt was thwarted, Benjamin Sisko said that "Armageddon will have to wait for another day". (DS9: "By Inferno's Light")