Symbols on DC power supplies? ~ ĐĂNG RAO VẶT

Friday, September 29, 2017

Symbols on DC power supplies?

Hi,
We can find a symbol of a square inside another square and I have seen it on several DC Power Supplies and cannot figure out what it means. I want to know whether it is an international symbol from the FCC.
Please help.

Thanks!

I didn't find the right solution from the Internet.

References:http://ift.tt/2fDAFOo

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