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What is the full form of STD, ISD AND PCO?

What is the full form of STD, ISD and PCO?

Full form of STD→SUBSCRIBER TRUNK DIALER
Full form of ISD→INTERNATIONAL SUBSCRIBER DIALING
Full form of PCO→PUBLIC CALL OFFICE

Subscriber trunk dialling (STD, also known as subscriber toll dialling) is a telephone system allowing subscribers to dial trunk calls without operator assistance. The term was introduced when it first became possible for long-distance calls to be dialled directly, and is now rarely used where calls to any destination can be dialled.
International direct dialling (IDD) or international subscriber dialling (ISD) is placing an international telephone call that is dialed directly by a telephone subscriber, rather than by a telephone operator. The term international subscriber dialling was used in the United Kingdom and Australia until the terminology was changed to international direct dialling. Since the late 20th century, most international calls are dialed directly.
A public call office (PCO) is a telephone facility located in a public place in India and Pakistan. It is also another name in the United Kingdom for a public telephone box (postal addresses for these kiosks sometimes include "PCO").

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