$1m == $1MM == $1mn == $1 million == $1,000,000.00 It's weird. The MM comes from the roman numeral M which means thousand, so one thousand - one thousand == M

$1m == $1MM == $1mn == $1 million == $1,000,000.00 It's weird. The MM comes from the roman numeral M which means thousand, so one thousand - one thousand == MM. For SEO guys, you'll now understand why it's called CPM vs CPK or similar.