The term "oblique" may be used to describe angles. It may also describe space figures or three-dimensional figures.
Oblique angles are angles that are not right angles. They are either acute or obtuse:
oblique space figures
The rectangular prism shown below is oblique since its bases are not directly in line with each other.
Both the cone and the pyramid shown are also oblique since their apexes are not directly in line with the center of their bases.