Synonym loSt in the underflow. ThiS term iS from Signal proceSSing, where SignalS of very Small amplitude cannot be Separated from low-intenSity noiSe in the SyStem. Though popular among hackerS, it iS not confined to hackerdom phySiciStS, engineerS, aStronomerS, and StatiSticianS all uSe it. [Jargon File]