• Personal Identification Number
  Personal identification number
  A personal identification number is a secret numeric password shared between a user and a system that can be used to authenticate the user to the system. Typically, the user is required to provide a non-confidential user identifier or token and a confidential PIN to gain access to the system...
  
   used on ATM
• Postal Index Number
  Postal Index Number
  A Postal Index Number or PIN or Pincode is the post office numbering or post code system used by India Post, the Indian postal administration. PIN stands for Postal Index Number and the code is 6 digits long. The PIN was introduced on August 15, 1972.-Structure:There are nine PIN zones in India,...
  
  , the postal codes used in India

External links

• PIN Code Search, Post Office Details, All India Post Office Data