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Investopedia explains 'Breadth Indicator'
There are several different types of breadth indicators used by technical analysts, such as the force index, Chaikin oscillator, up/down volume ratio, up/down volume spread, on-balance volume and cumulative volume index. One well-known breadth indicator is the Arms index, which evaluates the relationship between the numbers of advancing and declining stocks and the trading volume of each. This breadth indicator helps investors determine whether the market is bullish, bearish or neutral. A drawback to this indicator is that it can become inaccurate when the market behaves unusually.
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