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 Says:
If the value of this is less than 1, then it is considered to be a very bullish indicator

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Measure of stock market strength that relates the Advance-Decline ratio (the number of issues that advanced in price divided by the number of issues that declined in price) to the advance volume-decline volume ratio (the total number of shares that advanced divided by the total number of shares that declined). For example, if 800 stocks advanced and 750 issues declined while a total of 68 million shares advanced and 56 million shares declined, the trin would be calculated as follows:

Advances 800 ÷ Declines 750 1.067

------------------------ = ----

Advance volume 68,000,000 ÷ Decline volume 56,000,000 1.214

= 0.88

A trin of under 1.00 is considered bullish while a trin over 1.00 is considered bearish. The above trin of 0.88 is thus a bullish sign. A trin based on closing figures is called a closing trin. See also Closing Tick.