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(or meter) in the International System of Units (SI). However, m is sometimes also used as an abbreviation for mile.
* M is used as the unit abbreviation for molarity.
* With money amounts, m or M is ambiguous. In the finance industry, m or M means 1,000. In this context, five million dollars is written $5mm or $5MM. Outside of finance, some people use M like the metric system "mega-"

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