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The symbol of a square inside of a square for electrical purposes means double insulated.

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Q: What does the symbol a square inside a square mean?
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What does the symbol inside an elements square mean?

The symbol of an element is an abbreviation for the element's name, and it is derived either from the English or the Latin name. For example: Bromine's symbol is Br. The symbol inside an element's square is the element's atomic number, or the number of protons and neutrons in the element.


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The number or expression inside a radical symbol?

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What does the Hebrew symbol chai mean inside a six pointed star?

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