ex-votos

from The Collaborative International Dictionary of English v.0.48

Ex-voto \Ex`-vo"to\, n.; pl. {Ex-votos} (-t["o]z). [L. ex out
   of, in accordance with + voto, abl. of votum a vow.]
   An offering to a church in fulfillment of a vow.
   [1913 Webster]