The three-dimensional space in our universe is commonly referred to as Euclidean space. Euclidean space is a mathematical concept introduced by the ancient Greek mathematician Euclid. It is characterized by three mutually perpendicular axes, usually labeled as x, y, and z, which define the three dimensions of space.
In Euclidean space, points are represented by coordinates specifying their position along each axis. This coordinate system allows for the precise measurement and description of positions, distances, and directions in three-dimensional space. It forms the basis for much of classical physics and geometry.
It's important to note that our universe is generally considered to be a four-dimensional spacetime, where the three dimensions of Euclidean space are combined with time as the fourth dimension. This concept, known as Minkowski spacetime, was developed by the physicist Hermann Minkowski and is an essential component of Einstein's theory of general relativity. In Minkowski spacetime, the notion of distance incorporates both spatial separation and temporal duration, allowing for a unified description of events in the universe.