What Does Binary Space Partitioning (BSP) Mean?

Binary space partitioning (BSP) is a 3-D graphics programming technique that recursively subdivides a space into sets of two using a series of hyperplanes. The name derives from the fact that the data is represented using a binary tree data structure. BSP renders 3-D graphics by making spacial information about objects quicker to access.

Techopedia Explains Binary Space Partitioning (BSP)

Binary space partitioning is a 3-D graphics programming technique of dividing a scene into two recursively using hyperplanes. In other words, a 3-D scene is split in two using a 2-D plane, then that scene is divided in two using a 2-D plane, and so on. The resulting data structure is a binary tree, or a tree where every node has two branches.