"Trend Reversal" refers to trend reversals. It can be explained as the price movement in an uptrend returning to a downtrend by changing direction,
or the price action in a downtrend returning to an uptrend by changing direction.
These trend reversals can be reached with many technical analysis methods. You can observe these trend reversals by using technical analysis algorithms such as Double Bottom/Top, Wedge, Triangle, EMA, Super Trend etc. Coinlegs software detects the "Trend Reversal" by using the MACD indicator.