After a particular maket move, prices retrace a portion of previous trend before resuming to move in the original direction.
These counter trend moves / corrections tend to fall in certain predictable precentage parameter. The best knows - 50 % RETRACEMENT.
Besides 50% retracement, there are also 1/3 and 2/3 retracements.
This chart is current uptrend of BTC...
The vertical distance from the peak to the beginning of the trend is divided into thirds.
The upper line is the 2/3 speedline and the lower is the 1/3 speedline (dividing the vertical line in 2/3 and 1/3 respectively )
When an uptrend is in the process of correcting itself, the downside correction will usually stop at the higher speedline (the 2/3...