A transform in Unity contains all of the following except:

In Unity, a transform component is fundamental to every GameObject as it defines its position, rotation, and scale in the 3D space. The position specifies where the object is located within the world, the rotation defines the object's orientation, and the scale determines its size.

Mass, however, is not part of the transform component. Instead, mass is a property associated with a rigidbody component, which is used to give physical characteristics to the game object, allowing it to respond to physics-based interactions like gravity and collisions. This differentiation clarifies that while transforms manage the object's placement and shape, mass relates to how the object interacts physically within the game environment.