It means that the vehicle is carrying Hydrochloric Acid.
If you mean a diamond on the lane, that means that that lane is for BICYCLISTS ONLY, if you mean as a shape of a sign such as a "slippery when wet" sign, that usually tells you important things. I looked it up in my "Virginia Driver's Manual" and it says a diamond shaped sign is a warning sign.
1789 when james madison sign the constitution so in 1789
it means that the chemical or substance is poisonous
a lemon doesent have a hazard sign because it is a natural thing
warning sign...warning you of road hazards or upcoming objects. There is diamond type symbol found on the seals found from pre-historic Harappan Civilization in South Asia. the decrypted text shows it as a sign of currency.
The flammable sign was standardized by the National Fire Protection Association (NFPA) in the late 1940s. The NFPA developed a system of labeling flammable materials with a red diamond symbol to alert people to the fire hazard.
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I think the "Fallout Shelter" sign
bhenchod
The hazard symbol for copper sulphate is a white diamond with a skull and crossbones and the letters "T+" inside, indicating it is highly toxic. It also has the symbol "Harmful if swallowed" underneath.
Hazard close to the edge of the road. The downward lines show the side on which you may safely pass.
it means you need to charge it and fast or your battery will be SHOT!