A bar code is a series of bars and spaces representing numbers or letters.
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A method that is used for the purpose of representing a data in the form of a picture or image that can be easily understood by the machine. It consists of many lines that has different widths and spaces. They either represent the letter or a number. These are mainly used for the representation of data in the machine understandable format.
For example an UPC-A bar codes has 12 numbers. The numbering system is represented by the first digit. The manufacturer will be represented by the next five digits in it. The product will be represented by the five digits following it. Check digit is represented in the last digit.
What is that I never heard of that before
I've never seen that third syntax. If it's legit, it probably does the same as I and II, which are the same.
This question should be in physics so this is my answer in C&T format-go to a online shop and order one or the pieces then follow the instructions that will be given.
