peak-to-peak

The peak-to-peak amplitude of a waveform is the amplitude between its maximum positive value and its maximum negative value. The peak value is the maximum amplitude above zero.Typically used in electrical engineering and electronics to characterise a varying voltage or current.If the waveform is a pure sine wave, the relationships between peak-to-peak, peak, mean, and RMS amplitudes are fixed and known, but this is not true for an arbitrary waveform which may or may not be periodic.
See more at Wikipedia.org...