I don't know if there is a name for this pattern but I like to look for them. I'm a pattern trader and they appear frequently enough.
I had mentioned it in a post, but the wave did not terminate. So it can give two signals.

In the first chart note the third lower high after a double top came before it. Not a lot of support as upward trendlines keep breaking.
The pattern is a downward wave that terminates between the two previous lows. See the shaded area.

I know this is only a 3 minute chart but the pattern is fractal from my exrperience. It works on all timeframes.

I'm not saying one can make a killing with it either. It's more important to be aware of it so you don't die by making the wrong entry in a trade. I hope this is helpful in your trading.

Closeup. The wave terminates between the two previous lows.

This is what happens when the seemingly easy trade goes against you. It looked like a great short and a lot of traders obviously agreed.
This is a live after hours chart I'm using. Note the date and time of post and charts.