An arbitrarily shaped object refers to any object that does not conform to a regular or predefined geometric shape. In other words, it can have a complex, irregular, or unique form that cannot be easily described by simple geometric equations or parameters.

In aviation, when discussing lift, the term "arbitrarily shaped object" typically refers to aircraft wings or airfoils that do not have a simple, regular shape like a standard symmetric or cambered airfoil.

Most basic discussions of lift in aviation involve standard airfoil shapes because they simplify the analysis and understanding of aerodynamic principles.

Therefore, we can say arbitrarily shaped objects are objects that don’t have any lifting characteristic and produce mostly drag.