ArcGIS Pro 2.2 API Reference Guide
CIMCallout Class
Members 

ArcGIS.Core.CIM Namespace : CIMCallout Class
Represents a callout.
Syntax
Remarks
Callouts are used to define additional ornamentation for a symbol. The primary use for callouts is to add leader line capabilities to text. Callouts are also used for defining items such as highway shields, balloon callouts, and more complex text box and leader line combinations. All callouts have some capability to draw leader lines; therefore they share a base property of a leader tolerance.
Inheritance Hierarchy

System.Object
   ArcGIS.Core.CIM.CIMObject
      ArcGIS.Core.CIM.CIMCallout
         ArcGIS.Core.CIM.CIMBalloonCallout
         ArcGIS.Core.CIM.CIMLineCallout
         ArcGIS.Core.CIM.CIMSimpleLineCallout

Requirements

Target Platforms:Windows 10, Windows 8.1, Windows 7

See Also

Reference

CIMCallout Members
ArcGIS.Core.CIM Namespace