Use the model's parts diagram and describe the location as well as the appearance. Terms such as collar, flange, baffle and gasket can refer to different components around the sink opening and mounting.
What the observation tells you
A photograph with the area marked helps avoid ordering a splash baffle when the problem concerns a mounting seal. Do not remove the assembly just to find a name, and never assume that a rubber part visible from above is owner-removable.
A useful next step
Provide the complete appliance reference and a wider view showing where the component sits. Ask the supplier or engineer to confirm the diagram reference before agreeing to a replacement.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.