A “placard” is a sign (cartel) or announcement (letrero), for example, on a wall. In demonstrations mortals often “carry placards” (pancartas) to express a point of view.
Some examples:
– Five walls are placarded all over (…están llenas de carteles).
– Adrian´s house is placarded as a luxury residence (anunciada como una vivienda de lujo).
– We saw the opera advertised on a placard (vimos un anuncio de la opera en un cartel).
