Reflection symmetry occurs when one half of a figure is the mirror image of the other half across a line of symmetry.

Reflection symmetry occurs when one half of a figure is the mirror image of the other half across a line of symmetry.

Let's evaluate the options:

• A. All of the options: This is unlikely, as rotation and rotational symmetry are distinct concepts.
• B. Symmetry: This is a general term. Reflection symmetry is a specific type of symmetry.
• C. Rotation: This refers to turning a figure around a point, not reflecting it.
• D. Mirror image: This term directly describes what reflection symmetry creates – one side of the line of symmetry is a mirror image of the other side. This is a common informal way to refer to reflection.
• E. Rotational symmetry: This refers to a figure looking the same after a rotation, which is different from reflection.

Therefore, "mirror image" is the most appropriate informal language terminology for reflection symmetry.

The correct option is D.
D) Mirror image / Spieëlbeeld