On Mon, Jan 25, 2010 at 4:55 PM, Veronique Kessler vkessler@wikimedia.org wrote:
Thanks for the comment. The "mm" signifies millions which is the amount the timeline is representing, $6 million from 125,000 donors globally. If we were to replace it with one "m", that would signify only $6 thousand.
See also: http://wiki.answers.com/Q/What_is_abbreviation_of_million
I'm not sure whether to take you seriously given the reference at that link but anyway...
How about the fifth bullet point here: