white noise

kohina, valkoinen kohina puhekieltä A random signal (or process) with a flat power spectral density; a signal with a power spectral density that has equal power in any band, at any centre frequency, having a given bandwidth.
2005, John G. Holden, http://www.nsf.gov/sbe/bcs/pac/nmbs/chap6.pdf Gauging the Fractal Dimension of Response Times from Cognitive Tasks

Conventional statistical analyses presuppose that intrinsic variability is white noise. White noise yields a jagged and irregular line with a fractal dimension of 1.5, because successive observations are statistically independent of each other.