placard
US /ˈplæk.ɑːrd/
UK /ˈplæk.ɑːrd/
1.
tấm áp phích
a large piece of card, paper, etc. with a message written or printed on it, often carried in public places by people who are complaining about something:
:
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Demonstrators marched past holding/waving placards that said "Send food, not missiles!"