When you write 10M does that mean 10 million dollars?

Answer 1

Possibly. I have also seen it where the M means 1000 (taken from the Roman Numerals). so 10M would mean 10000 in that case. But then on a package of copy paper if you see 10M on the label, it means that paper weighs 10 pounds per 1000 sheets.

Answer 2

It could also mean 10 times some variable (M) or 10 metres, or 10 million Euros.