Technical analysis uses indicators to analyze market trends and identify reversals. Volume is an important indicator, with higher volume on uptrends and lower volume on downtrends signaling a strong trend. The Dow theory examines primary, secondary, and minor trends in the market over different time periods. Support and resistance levels and moving averages are also used to identify trends. Indicators like short interest, breadth of the market advances vs declines, and odd lot trading can provide additional signals about market strength and upcoming trend changes.