placard

noun: a public sign, usually paper, or a town notice. also, signs carried or worn by demonstrators or picketers.

verb: to publicize or advertise by usings placards, most commonly used when referring to protestors wearing placards.

(n) "I read about the town meeting on the placard hanging on the community bulletin board."

(v) The square was placarded by peace marchers.

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Mel placard

Airline term which means "minimum equipment list. In simple terms
This is a minor mx (maintenance) issue which will not keep the aircraft from flying it's prescribed route.

We have a reading light out in seat 39a's pcu(passenger control unit) we can put a mel placard on it and send it on its way