ArcGIS Pro 2.7 API Reference Guide
FlipAngle Property (AnnotationProperties)

ArcGIS.Desktop.Editing Namespace > AnnotationProperties Class : FlipAngle Property
Specifies the angle, in degrees from the vertical, at which point rotated text is flipped, or mirrored, in place. At this point the text starting point becomes the ending point and conversly.
Syntax
public Nullable<double> FlipAngle {get; set;}
Public Property FlipAngle As Nullable(Of Double)
Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

AnnotationProperties Class
AnnotationProperties Members