A very clear video for overhead casting
by Canberra Anglers Blog 4 Jun 20:09 UTC

Stop fly casting 10-2 and start using this method for longer casts © Capt. Chris Myers
Lyall and Nathan have spoken to me often of how to advance beyond the clock face 10-2 using the terms translation before rotation.
Ian tells me Peter Hayes signs off his emails with \\\\\\|/ (representing casting to the right).
This dude from Florida has different language ("isosceles trapezoid") but it is the same thing. His video with on-screen drawings make the concept very clear.