Exact formation
Two consecutive candles with practically the same lows; usually the first bearish and the second bullish.
What is happening in the market
The offer tries the same area twice and fails to continue; buyer response appears.
Where it matters
After a fall and on support. Equality is a zone, it does not need to match to the penny.
How to confirm it
Break of the high of the second candle or of the set.
When it is invalidated
Close below shared lows.
Common mistake
Search for exact match ignoring structure and normal volatility.