In today’s digital world where we do chat for hours with so many friends using words like BRB, LOL, etc, or in our profession we use words like PIN, BCC, GIF, ATM, etc. We may know that these are called abbreviation but do you really what actually these words mean? What does they stand for? Most of us hardly know. So, here i have gathered such 40 abbreviations which we frequently use in our day to day personal as well as professional lives, but we do not know what they stands for.