What is the gate-like structure used as walls in some churches called?

In several Catholic churches online, I have seen grilles used in large sections of the side walls. These are obviously not gates as they could not be opened. I was thinking it might be a "window grille" but had some doubts since they extend to the floor of the church. I tried searching for the specific term for these church elements but could not find any information. is an image from Wikimedia Commons (photo uploaded by Judgefloro).