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Milliseconds (msec) = 1/1000 of a second
Microseconds (μsec) = 1/1,000,000 of a second
Nanosecond (nsec) = 1/1,000,000,000 of a second
Milliamp (mA) = 1/1000 of an ampere
Microamp (μA) = 1/1,000,000 of an ampere
Angstrom (Å) = 1/10,000,000,000 of a meter
Nanometer (nm) = 1/1,000,000,000 of a meter
Hertz (Hz) = 1 cycle per second
Kilohertz (KHz) = 1000 cycles per second
Megahertz (MHz) = 1,000,000 cycles per second

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