A double top is a technical chart pattern that signals a potential reversal of an uptrend. It occurs when the price of an asset reaches a high point, retraces, then rallies back to a similar high before reversing downward. The pattern resembles the letter "M" and is formed by two consecutive peaks at approximately the same level, with a trough (the retracement) between them. Traders often interpret the double top as a bearish signal, suggesting that the upward momentum has weakened and that a downward trend may follow. It's essential for traders to look for confirmation through other technical indicators or price action before making trading decisions based solely on the double top pattern.