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I just discoved that MMM acronym was already used for Manual Moving Microphone in a very interesting comparison for airborne sound insulation measurements.

Conclusion : 8 This investigation suggests that the manual moving mic technique (MMM), which also involves taking the tester out of the source room, produces the most repeatable results in rooms of 30m3 or more when compared with any of the other test methods. Most notable is the improved accuracy and repeatability of this method at low frequency, where modal variations produce well-documented inaccuracies in the other, more traditional test methods.

I compared results ot this study to my own MMM theorical curves (see post below), it fits quite well.

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