A nine-digit number typed at the bottom of a letter believed to be sent by the infamous hijacker D.B. Cooper confirms the letter could have come from only one person, according to a cold-case ...

Ever wondered what the series of numbers and letters on your car's windshield means? These markings or codes that are either etched, printed, or affixed to your windshield on a label are not random.

I was never in the Secret Service nor have I ever reached the status of needing clearance to read or see anything that must be kept out of sight but after 20-odd years of working with computers I find ...

YOUR Sky TV is littered with mysterious letter and number codes – but what do they all mean? The Sun has pulled together a handy guide to unlock their secrets ...