placard
US
UK placard n: (public sign, notice)
SC 告示牌，广告牌，标语牌 gào shì pái，guǎng gào pái，biāo yǔ pái
TC 廣告牌
TC 廣告牌
SC 布告，海报 bù gào ，hǎi bào
TC 布告 / 佈告
TC 布告 / 佈告
You obviously didn't see the “NO JEANS” placard on the door.
placard n: (demonstrator's sign)
SC 小牌 xiǎo pái
SC 金属牌 xiǎo pái，jīn shǔ pái
The demonstrators made a fire of their placards at the end of the day.