Three-Dimensional Euclidean space
It is a 3-dimensional Euclidean Space, denoted by \(\Bbb R^3\) (or \(\Bbb E^3\)).
Originally, in Euclid's Elements, it was the three-dimensional space of Euclidean geometry, but in modern mathematics there are Euclidean spaces of any positive integer dimension n, which are called Euclidean n-spaces when one wants to specify their dimension