box2d — A 2-dimensional bounding box. Often used to describe the 2D extent of a geometry or collection of geometries.

`box2d`

is a spatial data type used to represent
the two-dimensional enclosing box of a geometry or collection of geometries.
For example, the ST_Extent aggregate function returns a `box2d`

object.

The representation contains the values `xmin, ymin, xmax, ymax`

.
These are the minimum and maxium values of the X and Y extents.