In Popoi's Notebook, the weaknesses/immunities for enemies are shown with the circle, triangle, X, and double-circle symbols. However, I don't have a manual for the game, so I have no idea what these symbols mean as they aren't explained in-game for some reason. Could someone enlighten me? X is a no-brainer, but I'm not quite sure on the others... here is my guess:
X = immune/no effect circle = weak double-circle = very weak triangle = normal effect
or, an alternate version:
X = immune/no effect circle = normal effect double-circle = weak/more damage triangle = strong/less damage
I've been searching around the internet but can't find anything that helps.