What does this mean?

Guangzhou, China
May 2, 2017 12:26am CST
Please, could anyone tell me what "Sd." probably means here? Certified true copy by (Sd.)
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2 responses
@owlwings (38187)
• Cambridge, England
2 May
I came to the same conclusion as @writerjo. I believe that it is an abbreviation for "Signed", in other words, the copy has been certified as a true copy of the original by someone.
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• Guangzhou, China
2 May
Thank you so much. Is "Sd." a common abbreviation for "signed" in business?
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@owlwings (38187)
• Cambridge, England
2 May
@Florarunning I would have said that "Sgd" was commoner but it may vary depending on the country.
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@writerjo (1320)
• India
2 May
Hi sd means signed .. by authorized signatory
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• Guangzhou, China
2 May
Thank you, Joshua.
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@writerjo (1320)
• India
6 May
Welcome @Florarunning