Origin
In earlier communications methods, an end of message ("EOM") sequence of characters indicated to a receiving device or operator that the current message has ended. In teleprinter systems, the sequence "NNNN", on a line by itself, is an end of message indicator. In several Morse Code conventions, including Amateur Radio, the prosign AR (dit dah dit dah dit) means End of Message.
In the original ASCII code, "EOM" corresponded to code 03hex, which has since been renamed to "ETX" ("end of text").
EOM is similar in concept to the EOF, or end of file. The EOF is placed at the end of a file to signify to the user where the end of file is.
Read more about this topic: End Of Message
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