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A placard is a sign or sign-like device attached to or hung from a vehicle to indicate information about the operator (of a vehicle) or the contents of the vehicle
Vehicle

Vehicles, derived from the Latin word, vehiculum, are non-living means of transport. Most often they are manufactured , although some other means of transport which are not made by humans also may be called vehicles; examples include icebergs and floating tree trunks....
 or building
Building

In architecture, construction, engineering and Real estate developer the word building may refer to one of the following:# Any man-made structure used or intended for supporting or sheltering any use or continuous occupancy, or...
.

acard is placed on a building to indicate special information about that building.






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A placard is a sign or sign-like device attached to or hung from a vehicle to indicate information about the operator (of a vehicle) or the contents of the vehicle
Vehicle

Vehicles, derived from the Latin word, vehiculum, are non-living means of transport. Most often they are manufactured , although some other means of transport which are not made by humans also may be called vehicles; examples include icebergs and floating tree trunks....
 or building
Building

In architecture, construction, engineering and Real estate developer the word building may refer to one of the following:# Any man-made structure used or intended for supporting or sheltering any use or continuous occupancy, or...
.

Buildings

Fallout Shelter
A placard is placed on a building to indicate special information about that building. The most common placard which had been used is the Fallout shelter
Fallout shelter

A fallout shelter is an enclosed space specially designed to protect occupants from radioactive debris or nuclear fallout resulting from a nuclear explosion....
 black and yellow trefoil
Trefoil

Trefoil is a graphic form composed of the outline of three overlapping rings used in architecture and Christian symbolism. The term is also applied to other symbols of three-fold shape....
 indicating that a building was specifically prepared for use for emergency shelter in the event of a nuclear explosion in the area of the particular building. Temporary placards may be placed on buildings such as warning signs over tent
Tent

A tent is a shelter consisting of sheets of textile or other material draped over or attached to a frame of poles or attached to a supporting rope....
ing to indicate the building is being fumigated
Fumigation

File:Tent_fumigation.jpgFumigation is a method of pest control that completely fills an area with gaseous pesticides - or fumigants - to suffocate or poison the pests within....
 and that no one should enter.

In some locations it is common practice, and in some areas (such as California
California

California is a U.S. state on the West Coast of the United States of the United States, along the Pacific Ocean. It is bordered by Oregon to the north, Nevada to the east, Arizona to the southeast, and to the south the Mexico state of Baja California....
) it is required by law that any primary entrance to a commercial building have a placard attached above the entrance door(s) reading "This door to remain unlocked during business hours."

Vehicles

The two most common placards in general use on vehicles are handicapped privilege tag
Handicapped tag

A handicapped tag or handicapped placard is a placard or license plate, permitting the owner or operator of a vehicle to special privileges regarding the parking of that vehicle, including the privilege to park in a space reserved for handicapped persons, or in some areas, permitting a person to park in a time-limited space for longer...
s for personal automobiles, and hazardous materials warning signs for commercial vehicles. There are other types, such as the "wide load" signs used when mobile home
Mobile home

Mobile homes or static caravans are prefabrication homes built in factories, rather than on site, and then taken to the place where they will be occupied....
s are transported by road.

Commercial vehicle placards are of two general types, the single indicator, where in specific information of a fixed nature is displayed by the sign, such as the yellow "oxidizing agent" sign below, and the NFPA "fire diamond" style device which can be changed to depict new information as the contents of the vehicle change, and which carries information about the compound being carried,plavard is similar to posters and logos,its flamability and resistance to water, for example.












This is an example of a fixed sign.This is another example of a fixed sign, although the information is basically for the use of emergency responders.This is an example of a changeable sign. This type of sign is sometimes displayed as a fixed sticker, but are often made with each of the four quadrants having either a slot to have different values inserted, or have a flip device allowing each of the quadrants to be changed.


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