To be clear (because I didn't cover Esko's unique naming in that post) - Esko's screening nomenclature is:
"Round (Fogra)" Short name "R"- This is what most vendors call Euclidean: Round/Square@50%/Inverted Round
"Circular (Euclidean)" Short name "C" - Round through the tone scale.
"Double Circular" Short name "F"- Round/Square @ around 75%/Inverted Round
This is a good reminder that, since there is variation in vendor halftone screening naming conventions, it is always a good idea when asking about screening to give the name as well as a description of the dots, e.g. Round/Square@50%/Inverted Round, so that it's clear as to the screen being discussed.