AABB ( English axis-aligned bounding box - "parallel to the axes bounding box") is a box with sides parallel to the coordinate axes , bounding some geometric object in space. When the object rotates, the parallelepiped retains its orientation, but can change its size. It is actively used in programming (for example, in the physical engines of various games) to detect collisions or intersections of various objects with each other.
More often the modulus of the maximum difference of the projections onto the selected axis between two points is taken for the dimensions of the parallelepiped. However, instead of a box, a cube with a side equal to the maximum size of the object can be used. With this technique, the object will never go beyond the cube, but accuracy may be lost.
The image of a special tool that displays AABB parameters in computer 3D-modeling applications is called a gizmo.