"The watt is a derived unit of power in the International System of Units (SI), named after the 18th-century Scottish engineer James Watt. Its unit symbol is W. The unit measures the rate of energy conversion."
"(...) Milliwatt
The milliwatt is equal to one thousandth of a watt. A typical laser pointer might output 5 milliwatts."
in http://en.wikipedia.org/wiki/Watt
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