[ajarmoniuk]

Pedantic: MM means 2 tousand if we are really to stick to roman numerals.

[xtacy]

Another pedantic remark is that people use $1K instead of $1M to mean $1000.

I think it's fine to use whatever it takes to get the message across.

[nuttendorfer]

Which stands for kilo and is correct.

[ph0rque]

Lowercase k stands for kilo; K stands for Kelvin (as long as we're being pedantic).

[batista]

It is uppercase in the comment above.

And a letter can stand for multiple things, from temperatures to chemical elements to whatever.

As long as we're being pedantic, that is.

[silon3]

That's why I always think that $1MM = $1M * 1000000

[icey]

There isn't a way to write one million in Roman numerals on a standard keyboard (it would be M with a bar over it, or "M" 1,000 times). Instead the shortcut "thousand thousand" (MM) gets used.