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It may refer to the Greek letter mu. It looks like a "u", with the left vertical line extended down (more or less like an upside-down "h"), and means "micro", a multiplier of 1/1,000,000. For example, a micrometer is a millionth of a meter (or a thousandth of a millimeter).

If you have trouble typing the letter "mu", you can substitute the letter "u".

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14y ago

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