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In Morse code, it is called a "commat", consisting of your Morse code with the "A" and "C" which run collectively as a person character:   ▄ ▄▄▄ ▄▄▄ ▄ ▄▄▄ ▄ . [four][fifteen] this concept from the symbol representing Situated at in the shape user@host can be noticed in other instruments and protocols; for example, t