Google says:

•The crest factor or peak-to-average ratio (PAR) or peak-to-average power ratio (PAPR) is a measurement of a waveform, calculated from the peak ...

en.wikipedia.org/wiki/Crest_factor•This is the ratio between the peak current and the average current required by the load. Computers normally exhibit a crest factor of 2 to 3 ...

www.noahtec.com/power-glossary-terms.htm•the ratio of the peak voltage to rms voltage of a signal, which is given by the following formula: For a sine wave the crest factor is 1.414, for ...

zone.ni.com/devzone/cda/tut/p/id/4439•In an AC circuit, Crest Factor is the mathematical ratio of the peak to RMS values of a waveform. Crest factor is sometimes used for describing ...

www.powerstream.com/glossary.html•The ratio of the non-linear peak current to the true RMS current. A sine wave has a crest value of 1.4142. For switchmode power supplies this ratio ranges from 2 to 4.

www.powersource.net/glossary.htm