Amen -
At the end of a creed or in Koranic and Biblical translations: truly, verily.
Wikipedia
The word Amen is a declaration of affirmation found in the Hebrew Bible and New Testament. Its use in Judaism dates back to its earliest texts. It has been generally adopted in Christian worship as a concluding word for prayers and hymns.
OmegaWiki Dictionary
Ω
Amen Interjection said or sung by Jews or Christians to express a wish that the prayer should be fulfilled.