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I commonly see "NMI" for "No Middle Initial."

Sounds like NMI actually is TMI. Perhaps you meant NMN?

Might be a factor of certain systems. I was registered with NMI (not having a middle name) on IBM computers in the early 1970s. Not seen it since....

We were still using punch cards back then.

Star Trek memorably listed LT CDR NFN/NMI DATA, see the screenshot at http://memory-alpha.wikia.com/wiki/Data (third from the top, on the right).

Ah, thanks!