Funny that caus you could also read the graph as a bullish engulfing indicator the day before last on your chart. There's so many indicators that show different things it's pointless. You won't find one that's right more than 50% of the time I'm afraid.
Lol! I'v got an oscillator indicator that right 70% of the time, but it lacks the precision of being able to pick a top or bottom within +/- a day and within a very narrow margin of price however it is good at confirming trades once the turn has become apparent.
If anyone thinks they got a better system than what I use by all means share your ideas...