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The term "bar code" in reference to the series of bars marked on packages for machines to read, is a rapidly changing term. Although most dictionaries mandate that the term is two words, the English-speaking society is in the process of changing it to one. Just as "Electronic mail" quickly changed to "E-mail," then to "e-mail" and finally to just "email," bar code is in the process of becoming barcode. If you are using the term in a formal document, make it two words. If you are writing it in an informal document, the choice is yours.
Yes it can, it is a letter that can take a byte or memory such as, punctuation marks. binary code : 00100000
32 is the ASCII Code for a space.