moving body; mobile object
Technical term used in physics, engineering, and related fields to refer to an object in motion or capable of moving. Not typically used in everyday conversation.
In this simulation, we calculate the trajectory of the moving body.
Mobile communication technology is developing rapidly.
物体 means a physical object or body, but does not inherently imply motion; 移動体 emphasizes that the object is moving or mobile.
mobile communications; cellular communications
mobile network operator; MNO; wireless service provider
mobile virtual network operator; MVNO
Compound of 移動 (movement) and 体 (body). A straightforward technical coinage.