it is because it is harmful and can burn the skin
The hazard symbol you should find on a container of hydrogen is a flame symbol indicating that hydrogen is highly flammable.
You would typically find the flammable symbol on products or containers that contain flammable materials like gasoline, solvents, or chemicals. The symbol is a red diamond with a flame symbol inside and is used to warn individuals about the potential fire hazard.
You would most likely find a symbol indicating that the substance is corrosive, such as the corrosive symbol (skull and crossbones). It is important to handle concentrated acids with caution due to their corrosive nature.
You can usually find hazard symbols near dangerous materials or areas like maybe you would find lots of radioactive hazard symblols in chernobyl, where the atomic explosion happened.
For the UK - See related link.
The hazard symbol you would most likely find on a concentrated acid is the corrosive symbol. This symbol indicates that the acid can cause severe skin burns and eye damage upon contact. It is important to handle concentrated acids with caution and use appropriate protective equipment.
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Would you find an airport symbol on the globe
Two hazard symbols commonly found on oven cleaner in a spray can are the corrosive symbol, which indicates that the product can cause skin burns and eye damage, and the environmental hazard symbol, which signifies that the product may be harmful to aquatic life if not disposed of properly.
The hazard sign is recognisable by its shape. It will have a distinctive colour, often reflective, around its edge. These may vary by region and you can find local hazard signs in a highway code handbook.
Not everything has a symbol for it. The concept of fume safety, if it is a concept, does not have a specific symbol.
You would find it in the fire and explosion hazard data section.