Grade 12th pass8 grade science
What is
STD full form
ISD full form
PCO full form
Where are these terms used?
What is
STD full form
ISD full form
PCO full form
Where are these terms used?
1 Answer
Pawan Prajapati
STD full form is Subscriber Trunk Dialling
ISD full form is International Subscriber Dialling
PCO full form is Public Call Office
The terms STD ISD PCO are used in the telephone system. They allow subscribers to dial trunk calls without operator assistance through trunk lines.
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