placard

/ˈplækɑrd/
noun
  1. A large sign or notice that is displayed in a public place to advertise something or give information.
    • A placard on the wall announced the date of the town meeting.
    • The museum placed a placard next to the painting explaining its history.
    • The protesters held a placard that read 'Save Our Forests.'
verb
  1. To cover or decorate with placards, or to display something on a placard.
    • The activists placarded the city walls with posters about the rally.
    • They placarded the notice on the community board for everyone to see.
    • The storefront was placarded with advertisements for the sale.