The Brains Trust - 2021, page-1198

I believe Edwards and Magee were the first to use the term "Megaphone", Shabacker referred to either
a Broadening Top (or very rarely a bottom) as a major reversal pattern and to the "Inverted Triangle"
whether right-angled or symmetrical as a closely related minor reversal or continuation pattern.
The term Megaphone seems to have become more loosely used by traders in the context of any one
of the above patterns, but Shabacker writes quite extensively on and is clear on the technical distinction
of the Broadening Top in that is requires exactly 5 (no more & no less) touches beginning with a swing
in the opposite direction of the previous major trend. Regardless The minimum measuring formula from
the breakout point is the same for them all.
Not sure if you mean "target", as in a trade opportunity, as Shabacker was not very in favour of trading
within patterns owing to the complication of stop-loss placement and reliability, though that definitely
looks a level it could be working its way down to....
All the best