blip

blip

n.
  1. a spot of light on a radar screen, showing the position of a reflecting surface, such as an airplane or ship. (Radar)
  2. a short upward or downward deviation from a trend line on a graph, especially in a plot of some variable, such as an economic variable, against time; as, a brief blip upward in the unemployment rate.
  3. something small or insignificant.
  4. a brief interruption in the continuity of a recorded or transmitted signal; as, there is a blip on my CD of Beethoven's ninth.