Earlier quoted context omitted.
Two small notes: - The 'mln' abbreviation was probably used to shorten the title so that it would appear complete on search engine results. - I have also seen "MM" used to shorten "million". I believe that "M" means "Molarity" in SI units, and only means millions when prepended to another SI unit abbreviation.
- I do not understand how 'mln' is more SEO than 'M' - https://en.wikipedia.org/wiki/Mole_(unit) states that it's 'mol', but what do I know, I'm not a chemist Without context '70M' should be assumed unitless, and therefor must be interpreted as a power suffix symbol. Better yet, it falls outside the hex range, making life even better for everyone. Perhaps, if I'm really trying to be difficult, we could try to interpr…
There are limits to how many characters and pixels Google and Bing will display before cutting off a title and appending an ellipsis. I believe that mln was chosen for stylistic reasons, to differentiate from molarity...
>"[Wikipedia] states that it's 'mol', but what do I know, I'm not a chemist"
'M' is used for molarity (molar concentration), not moles.[1]