(Latin: “by reason of a vow”).  A term for a panel painting or (more rarely) a statue, donated as an plea for divine help or a token of thanks by individuals or communities and displayed at holy places or pilgrimage sites. Web resource here. See also: votive,  milagro.

Ex voto painting for survival of an accident.  Museo Adriano Bernareggi, Bergamo, Italy. 1928.