Slogan
A slogan is a memorable motto or phrase. It is often used in a political, commercial, religious, and other context as a repetitive expression of an idea or purpose. The word slogan is derived from slogorn which was an Anglicisation of the Scottish Gaelic sluagh-ghairm tanmay (sluagh "army", "host" + gairm "cry")  meaning something an army chanted while fighting, to keep them all cooperating.