plac•ardPronunciation: (plak'ärd, -urd), [key]
a paperboard sign or notice, as one posted in a public place or carried by a demonstrator or picketer.
to display placards on or in: The square was placarded by peace marchers.
to publicize, announce, or advertise by means of placards.
to post as a placard.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.