Breadth Indicator
A specific type of indicator that uses advancing and declining issues to determine the amount of participation in the movement of the stock market.
Investopedia Commentary
There are several different types of breadth indicators used by technical analysts.
Related Links
Discovering the Absolute-Breadth Index and the Ulcer Index
Market Breadth: A Directory of Internal Indicators
See also: 52 Week High/Low, Advance/Decline Line, Cumulative Volume Index - CVI, Haurlan Index, Indicator, McClellan Oscillator