M or MM? I prefer "M" -- it's shorter, but someone here was pushing for "MM".
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3$\begingroup$ I don't think that this is on-topic, but I will wait for others to vote to close it. $\endgroup$– ShaneOct 25, 2010 at 20:29
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2$\begingroup$ Plenty of answers are at google.com/search?q=abbreviate+millions . $\endgroup$– whuber ♦Oct 25, 2010 at 20:40
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2 Answers
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I would use M, as it is the SI prefix for million (mega-).
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I would use "million", or 10^6, because M stands for molar (concentration in moles per litre) in my discipline.
answered Oct 25, 2010 at 21:39
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2$\begingroup$ I cannot think of any situation in which molar can be confused with "millions". Millions is not generally used by itself, you usually write, for instance, 2M€, 2Mb or 2MΩ. Moreover, you use Molar next to a chemical name, es. CaCl2 0.5M, so there is no ambiguity. $\endgroup$– nicoOct 25, 2010 at 21:44
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$\begingroup$ +1 for scientific notation - the clear, simple and widely used approach. $\endgroup$– Tim ♦Jan 11, 2015 at 19:51