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The symbol of a square inside of a square for electrical purposes means double insulated.
It is a symbol used by recovering alcoholics, the three points represent the 3 parts of the disease, the circle means perfection.
The symbol for pi (π) has been used in mathematics for centuries to represent the ratio of a circle's circumference to its diameter. The use of the symbol π to represent this ratio was popularized by the Welsh mathematician William Jones in 1706. Jones introduced the symbol in his book "Synopsis Palmariorum Matheseos," where he used π as an abbreviation for "periphery." Over time, the symbol became widely adopted in mathematical literature and is now universally recognized as representing the mathematical constant pi.
┴ that one. Sometimes it'll have a small square to indicate a right angle.
Figure B