Arms Index (TRIN) is one of useful technical indicator used in forex technical analysis. This indicator developed by Richard Arms who created it in 1967.

The arms index shows the dependence of the volume associated with the stocks is increasing or decreasing in price, the so-called advancing / declining volume, and stocks is increasing or decreasing in price, the so-called advancing / declining.

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From Investopedia
TRIN stands for TRaders’ INdex. A ratio of 1 means that the market is in equilibrium; than 1 means that more volume moves in stocks and declining below 1 means that more volume is a step in the promotion of stocks. This indicator was developed by Richard Arms. (full article)

From Forexrealm
For years, this index has many different names. They called it the short-term trading index after the first article by Barron in 1967. It is also the TRIN is an acronym for the trade index. (full article)

From Traderslog
The TRIN (short for trading index) is an indicator developed by Richard J. Arms, with the number of shares advancing as compared to the declining number of shares, and the volume of promoting stocks in comparison to the volume of declining stocks Mark bullish and bearish momentum in the market, as well as overbought and oversold points. (full article)