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int_19h 10 hours ago

In echomail they were known as "Origin" because the intended purpose of that line was to identify the originating node. It looked like this:

  * Origin: any random text (12:34/56.78)
The text was supposed to be the name or description of the node, but this wasn't mandated by the rules, and the address at the end unambiguously identified the node anyway for anyone who cared, so people quickly repurposed it for taglines.