This Independence Day, India is also celebrating another important milestone. The Postal Identification Number (PIN), which is used to send letters, couriers and other postal items across the country, has turned 50 today. It was introduced on August 15, 1972. PIN codes are six-digit codes that are used by the postal service in India as a numbering system. They are also known as area codes or zip codes. The Postal Identification Number makes it easier for the postman to locate and deliver a letter or package to the intended recipient.
The PIN code system was introduced in the country by Shriram Bhikaji Velankar, who served as additional secretary in the Union Ministry of Communications and was a senior member of the Posts and Telegraph Board.