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The picowatt (pW), not to be confused with the much larger petawatt (PW), is equal to one trillionth (10−12) of a watt. Technologically important powers that are measured in picowatts are typically used in reference to radio and radar receivers, acoustics and in the science of radio astronomy.
Horsepower (symbol: hp) is a unit of measurement of power (the rate at which work is done). There are many different standards and types of horsepower.