TRIN
Short for TRaders INdex. A technical analysis indicator calculated by taking the advances-to-declines spread and dividing that by the volume of advances to declines.
Investopedia Commentary
If the value of this is less than 1, then it is considered to be a very bullish indicator
Related Links
Traders Index (TRIN)
Introduction To Technical Analysis
Market Breadth: A Directory of Internal Indicators
See also: Advance/Decline, Bull, Volume