Joe,
It seems *extremely* unlikely that the pattern was chosen in reference
to nonlinear programming.
It didn't. It is just a sequence of characters chosen as unlikely to be found in the body of a message sent to Groups.io. Martyn's assertions of meaningfulness notwithstanding. Mark could have chosen a longer or more random string, but there never has been a reason to bother.
This topic was niggling at my memory and I found it. Seven years ago someone noticed the text and posted its Morse translation in beta - in an unrelated topic.
It isn't clear how or why LAurence noticed the string. Maybe he (and maybe Martyn) uses an email client that displays HTML formatted messages in plain text. In an ordinary email client that string would be invisible, being formatted to be invisible (small & white):
<div width="1" style="color:white;clear:both">_._,_._,_</div>
Shal
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