It is a DOT hazmat placard meaning "compressed oxygen."
explosives
explosives
The radioactive placard on a vehicle indicates that the vehicle carries some amount or regulated radioactive material.
This is the UN Identification Number.
A poisonous gas placard typically features the hazard symbol for toxic chemicals, which is a skull and crossbones symbol. The placard may also include the UN number for the specific poisonous gas, as well as any additional information required by regulations. The placard is usually in a diamond shape and is orange with black symbols.
The Dangerous When Wet placard is a square on point (or diamond) placard with white markings on a blue background. The words "Dangerous When Wet are printed across the middle, with a drawing of a flame centered in the upper corner, and the numeral four (4) in the bottom corner to indicate the Hazard Class.
Signs that indicate an unripe orange include a firm texture, greenish color, and a lack of sweetness or juiciness.
phenolphthalein, methyl orange.
The word placard (noun meaning a sign, a notice, an advertisement) has no direct antonym; the closest would be 'without placard' or 'placard-less'.
Someone has misspelled my name on this placard. A sandwich sign is a two-faced placard!
In French, "placard" is masculine.