explosives
This is the UN Identification Number.
It is a DOT hazmat placard meaning "compressed oxygen."
The placard on the wall displayed the museum's latest exhibition information.
The word placard (noun meaning a sign, a notice, an advertisement) has no direct antonym; the closest would be 'without placard' or 'placard-less'.
the placard have been posted everywhere.
placard means a poster for public display. Example: there was no placard outside.
It is to designate Class 1 - Explosives (dynamite, black powder).
Le placard (masc.) means the cupboard in English.
The DOT hazard classification system can be used to identify acute hazards.
dans mon placard means 'in my cupboard' in English.
It is a DOT hazardous materials placard indicating compressed oxygen.