👉 Quadrilocular is a term used in the context of optics, specifically in the field of optical systems. It refers to a type of optical element that consists of two lenses or mirrors that are arranged in a specific configuration to focus light from one direction onto another. The term "quadrilocular" comes from Latin and means "two-sided," indicating that it is used to describe an optical system that can be rotated 90 degrees clockwise or counterclockwise, depending on the orientation