Wikipedia
Shot noise
Shot noise or Poisson noise is a type of electronic noise which can be modeled by a Poisson process. In electronics shot noise originates from the discrete nature of electric charge. Shot noise also occurs in photon counting in optical devices, where shot noise is associated with the particle nature of light.
Usage examples of "shot noise".
A bullet whistled through the branches, making sharp, ugly sounds, and the shot noise itself followed, thumping and echoing from the surrounding hills.