In technical analysis, a "breakout" occurs when the price of an asset moves outside of a defined support or resistance level. This can be seen as a signal that the asset is shifting from a period of consolidation to a period of trend.
On a 15-minute timeframe, a breakout of a trend may indicate that the direction of the trend is changing and that the price is likely to continue moving in the direction of the breakout. However, it's important to note that breakouts can be difficult to identify and can sometimes result in false signals. It is always a good idea to confirm a breakout using other technical indicators or by analyzing the fundamental factors that may be driving the move.