LETTER: Barcode sorter machines are necessary. Letter to the editor. Being a postal service annuitant, I feel I have legitimate input. Remembering back to orientation, ...

To send a hand-written letter is to take a break from today's digital world, says Dinah Johnson. So when she heard about the U.K. Royal Mail was adding barcodes to their stamps, she wasn't exactly ...

RM4SCC barcodes can encode numeric digits 0-9, all uppercase letters along with opening and closing parentheses. These codes must be a minimum of 35.98 millimetres wide and a maximum of 68.58 ...

The barcode also unleashed many more kinds of barcodes, including siblings of the original with more lines representing more numbers and letters, and distant cousins that look nothing like it.