Placard

The skull and crossbones sign is a well-known symbol for poison

A placard is a sign made to inform people about something. Often, they are used to warn about danger. Very often, hazard symbols (special pictograms) are used.

Sometimes, placard is also used to mean a leaflet that shows how a certain machine should be operated.

Placard Media

A fallout shelter sign in the United States of America.
A NFPA 704 symbol for acetone.
A Slovenian truck with Izredni prevoz, Vanredni Prevoz, Convoi exceptionnel^[a] placards and red and white striped placards for defining the dimensions of the load.
UN transport pictogram - 1
European Agreement concerning the International Carriage of Dangerous Goods by Road
European Agreement concerning the International Carriage of Dangerous Goods by Road
UN transport pictogram - 8
A dangerous goods placard for Class 9 - Miscellaneous dangerous goods from the ADR (European Agreement concerning the International Carriage of Dangerous Goods by Road).
ADR labels for dangerous goods, class 1 - Explosive substances and articles used to produce explosions or pyrotechnic effect
US Department of Transportation sign for Class 2.2 dangerous goods

This short article can be made longer. You can help Wikipedia by adding to it.

Cite error: There are <ref> tags on this page, but the references will not show without a {{Reflist|group=lower-alpha}} template or a <references group="lower-alpha"/> tag.

[a]