The symbol of a square inside of a square for electrical purposes means double insulated.
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I have a gold ring that has a square inside the band an it has a dot in the middle of square. What does it mean?
Heavy Gold Filled..
Nausea vomiting dry; itchy skin pile
The 4 interior right angles inside a square add up to 360 degrees
I believe the FM is Franklin Mint. Not sure about the number. Might be the whole is the copyright designation since the copyright symbol (c in a circle) precedes the fm85