End of message or EOM (as in "(EOM) " or "<EOM>" ) signifies the end of a message, often an e-mail message.Lifehacker, How " EOM " Makes Your Email More Efficient 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.
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