All I know is that when both sides are facing the same direction, that's called "medal alignment." When the sides are opposite, that's "coin alignment." So, I assume, pieces considered medals should have both sides facing the same. I'm not sure how true that is, though, in practice.
In Memory of Crazyb0 12-26-1951 to 7-27-2020
In Memory of Tootallious 3-31-1964 to 4-15-2020
In Memory of T-BOP 10-12-1949 to 1-19-2024