ArcGIS Pro 2.9 API Reference Guide
RendererDefinition Class
Members 

ArcGIS.Desktop.Mapping Namespace : RendererDefinition Class
Represents an abstract class definition for all types of renderers.
Syntax
public abstract class RendererDefinition : LayerDrawingDefinition 
Public MustInherit Class RendererDefinition 
   Inherits LayerDrawingDefinition
Remarks
RendererDefinition classes allow you to define parameters to create renderers to draw features with simple renderer or based on unique values or the values of a quantitative attribute that is statistically grouped by a classification algorithm.
Once you define a renderer, you can call a FeatureLayer's CreateRenderer and SetRenderer methods to create and assign a renderer to a feature layer.
Inheritance Hierarchy

System.Object
   ArcGIS.Desktop.Mapping.LayerDrawingDefinition
      ArcGIS.Desktop.Mapping.RendererDefinition
         ArcGIS.Desktop.Mapping.ChartRendererDefinition
         ArcGIS.Desktop.Mapping.ClassBreaksRendererDefinition
         ArcGIS.Desktop.Mapping.DotDensityRendererDefinition
         ArcGIS.Desktop.Mapping.HeatMapRendererDefinition
         ArcGIS.Desktop.Mapping.PointCloudRendererDefinition
         ArcGIS.Desktop.Mapping.ProportionalRendererDefinition
         ArcGIS.Desktop.Mapping.SimpleRendererDefinition
         ArcGIS.Desktop.Mapping.UnclassedColorsRendererDefinition
         ArcGIS.Desktop.Mapping.UniqueValueRendererDefinition

Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

See Also

Reference

RendererDefinition Members
ArcGIS.Desktop.Mapping Namespace