Courses
Courses for Kids
Free study material
Offline Centres
More
Store Icon
Store

What is 

STD full form 

ISD full form 

PCO full form

Where are these terms used?

seo-qna
Last updated date: 20th Jul 2024
Total views: 384.5k
Views today: 4.84k
Answer
VerifiedVerified
384.5k+ views

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.