pink noise
A signal with a frequency spectrum such that the power spectral density is inversely proportional to the frequency. Used in acoustics, audio engineering, and sometimes for relaxation or sound masking.
Pink noise has more emphasis on low frequencies than white noise.
Variant with interpunct, sometimes seen in technical contexts.
Loanword from English 'pink noise', where 'pink' refers to the spectral tilt analogous to pink light having more low-frequency content.