disambiguation: this is about the Feature Symbology (which is a property of a Feature Definition). How A Feature's Symbology (how it displays is a deeper dive into how the feature actually displays).
A Feature Definition's definition includes a Feature Symbology, which includes one or more Element Templates and other settings.
OpenRoads is 2D/3D environment with some industry representations of an object. Each of these may display differently.
Example: various agencies may require a centerline to display with one symbology and its dependent Profile Grade Line to display differently. A single Feature Symbology may point to a Plan Element Template, a different 3D Element Template and a different Profile Element Template.