In the town of Pangil, Laguna is an image of the Virgin of Expectation which the people call as Nuestra Senora de la O. I have been intrigued by this title. I asked people about the title and they say that she is called Nuestra Senora de la O because she answers "OO" (Yes) to all petitions given to her. Well, that's folk religiosity for you! Anyway, further reading about this image of the Virgin is that during the Christmas Novena (simbang gabi), a peculiar antiphon is sung wherein the Virgin is addressed with the "O". I thought it was the "O Antiphons" of Advent until I stumbled upon an article by Fr. Z about the Spanish Veneration to Our Lady of Expectation, popularly known as Nuestra Senora de la O.
This is interesting read: Expectation of the Blessed Virgin – interesting customs