Because, although "dangerous", lemons can't really harm you for life. It can't really kill you unless you actually try, and even if you did all I can think that it could do is blind you if you're really unlucky.
Also lemons are fruit. It would be strange if they put warning labels on them.
The oxidizing hazard symbol means the substance has the ability to react with oxygen, usually dangerously.
In many countries it is a legal requirement to use signs as a warning of dangerous substances, such as corrosive acid or poisonous materials. Many science laboratories use such substances in testing or development, and therefore usually use protective gear or other safety equipment. The signs is intended to warn others of the potential hazard inside the laboratories if safety precautions is not followed.
physical hazard
That red flag is a warning sign. The cat is warning the puppy.
A window warning.
a lemon doesent have a hazard sign because it is a natural thing
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It is part of the hazard warning module at the back of the switch
If you are talking about the flasher is is part of the hazard warning module If you are talking about the flasher is is part of the hazard warning module
The hazard warning label for oxygen is "Oxidizing Gas." This label indicates that oxygen can accelerate the combustion of other materials and poses a fire hazard. It is important to handle oxygen with care to prevent accidents.
The hazard warning label for oxygen is a green and white label with the word "OXYGEN" written in black letters. This label indicates that the substance is an oxidizing gas that can enhance combustion and pose a fire hazard.
Part of the hazard warning module
Colors
because of safety
Incorporated in the hazard warning module part of the hazard switch
The hazard symbol warning of a flammable liquid looks link a stylized flame.