Hello, I'm an expert in the field of finance and mathematics. When it comes to financial terminology, "M" is often used as an abbreviation for "million." However, if you're referring to "thousand," the standard abbreviation is "K," which stands for "kilo," a prefix in the metric system denoting a factor of a thousand.

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The Roman numeral M is often used to indicate one thousand, and MM is used to indicate one million. For example, an expense of $60,000 might appear as $60M. Sales of $3,000,000 might be written as $3MM. Internet advertisers are familiar with CPM which is the cost per thousand impressions.read more >>