'''Troparion''' (also ''tropar''; plural ''troparia'') is a type of hymn in the [[Orthodox]] [[Church]] and other Eastern [[Christian]] churches. The term most often refers to the ''apolytikion'', the thematic hymn which closes [[Vespers]]. (In Greek churches, the apolytikion troparion is known simply as the ''apolytikion''; in most other churches, it is known simply as the ''troparion''.) This troparion serves as a thematic hymn and is repeated at every service of the day.