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A UPC-A barcode. A barcode or bar code is a method of representing data in a visual, machine-readable form. Initially, barcodes represented data by varying the widths, spacings and sizes of parallel lines. These barcodes, now commonly referred to as linear or one-dimensional (1D), can be scanned by special optical scanners, called barcode ...
en.wikipedia.org
en.wikipedia.org
For the 4-digit codes, the first 3 digits indicate the day of the year and the last digit is the year. A date code of 1987 would indicate the car was made on the 198th day of 2017 (July 17). A code of 0250 would be the 25th day of 2010 (or 2020; depending on the car). Date codes only indicate when a specific car was made.
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Morse code. Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs. [3] [4] Morse code is named after Samuel Morse, one of the early developers of the system adopted for electrical telegraphy .