public CIMMarker ConstructMarker( 
   int characterIndex,
   string fontFamily,
   string fontStyle,
   int size
)

{
    //create marker from the Font, char index,size,color
    //Note: Needs QueuedTask to run
    var cimMarker = SymbolFactory.Instance.ConstructMarker(125, "Wingdings 3", "Regular", 6, ColorFactory.Instance.BlueRGB) as CIMCharacterMarker;
    var polygonMarker = cimMarker.Symbol;
    //modifying the polygon's outline and fill
    //This is the outline
    polygonMarker.SymbolLayers[0] = SymbolFactory.Instance.ConstructStroke(ColorFactory.Instance.GreenRGB, 2, SimpleLineStyle.Solid);
    //This is the fill
    polygonMarker.SymbolLayers[1] = SymbolFactory.Instance.ConstructSolidFill(ColorFactory.Instance.BlueRGB);
    //create a symbol from the marker 
    //Note this overload of ConstructPointSymbol does not need to be run within QueuedTask.Run.
    var pointSymbol = SymbolFactory.Instance.ConstructPointSymbol(cimMarker);
}

/// <summary>
/// Create a line symbol with the markers placed at a 45 degree angle. <br/>  
/// ![LineSymbolAngleMarker](https://ArcGIS.github.io/arcgis-pro-sdk/images/Symbology/line-marker-angle.png)
/// </summary>
{
  //Create a line symbol with the markers placed at a 45 degree angle.
  //Create a marker from the "|" character.  This is the marker that will be used to render the line layer.
  //Note: Run withing QueuedTask
  var lineMarker = SymbolFactory.Instance.ConstructMarker(124, "Agency FB", "Regular", 12);

  //Default line symbol which will be modified 
  CIMLineSymbol lineSymbolWithMarkersAtAngle = SymbolFactory.Instance.ConstructLineSymbol(ColorFactory.Instance.BlackRGB, 2, SimpleLineStyle.Solid);

  //Modifying the marker to align with line
  //First define "markerplacement"
  CIMMarkerPlacementAlongLineSameSize markerPlacement = new CIMMarkerPlacementAlongLineSameSize()
  {
    AngleToLine = true,
    PlacementTemplate = new double[] { 5 }
  };
  //assign the markerplacement to the marker
  lineMarker.MarkerPlacement = markerPlacement;
  //angle the marker if needed
  lineMarker.Rotation = 45;

  //assign the marker as a layer to the line symbol
  lineSymbolWithMarkersAtAngle.SymbolLayers[0] = lineMarker;
}

/// <summary>
/// Create a line symbol with a dash and two markers. <br/>
/// In this pattern of creating this symbol, a [CIMVectorMarker](https://pro.arcgis.com/en/pro-app/sdk/api-reference/#topic6176.html) object is created as a new [CIMSymbolLayer](https://pro.arcgis.com/en/pro-app/sdk/api-reference/#topic5503.html).
/// The circle and square markers created by [ContructMarker](https://pro.arcgis.com/en/pro-app/sdk/api-reference/#topic12350.html) method is then assigned to the [MarkerGraphics](https://pro.arcgis.com/en/pro-app/sdk/api-reference/#topic6188.html) property of the CIMVectorMarker. 
/// When using this method, the CIMVectorMarker's [Frame](https://pro.arcgis.com/en/pro-app/sdk/api-reference/#topic6187.html) property needs to be set to the [CIMMarker](https://pro.arcgis.com/en/pro-app/sdk/api-reference/#topic3264.html) object's Frame. 
/// Similarly, the CIMVectorMarker's [Size](https://pro.arcgis.com/en/pro-app/sdk/api-reference/#topic3284.html) property needs to be set to the CIMMarker object's size.
/// This line symbol comprises three symbol layers listed below: 
/// 1. A solid stroke that has dashes.
/// 1. A circle marker.
/// 1. A square marker.
/// ![LineSymbolTwoMarkers](https://ArcGIS.github.io/arcgis-pro-sdk/images/Symbology/line-dash-two-markers.png)
/// </summary>
{
  // Create a line symbol with a dash and two markers.
  //default line symbol that will get modified.
  //Note: Run withing QueuedTask
  CIMLineSymbol dash2MarkersLine = new CIMLineSymbol();
  //circle marker to be used in our line symbol as a layer
  var circleMarker = SymbolFactory.Instance.ConstructMarker(ColorFactory.Instance.BlackRGB, 5, SimpleMarkerStyle.Circle) as CIMVectorMarker;
  //circle marker to be used in our line symbol as a layer
  var squareMarker = SymbolFactory.Instance.ConstructMarker(ColorFactory.Instance.BlueRGB, 5, SimpleMarkerStyle.Square) as CIMVectorMarker;
  //Create the array of layers that make the new line symbol
  CIMSymbolLayer[] mySymbolLyrs =
      {
              new CIMSolidStroke() //dash line
              {
                  Color = ColorFactory.Instance.BlackRGB,
                  Enable = true,
                  ColorLocked = true,
                  CapStyle = LineCapStyle.Round,
                  JoinStyle = LineJoinStyle.Round,
                  LineStyle3D = Simple3DLineStyle.Strip,
                  MiterLimit = 10,
                  Width = 1,
                  CloseCaps3D = false,
                  Effects = new CIMGeometricEffect[]
                  {
                      new CIMGeometricEffectDashes()
                      {
                          CustomEndingOffset = 0,
                          DashTemplate = new double[] {20, 10, 20, 10},
                          LineDashEnding = LineDashEnding.HalfPattern,
                          OffsetAlongLine = 0,
                          ControlPointEnding = LineDashEnding.NoConstraint
                      },
                      new CIMGeometricEffectOffset()
                      {
                          Method = GeometricEffectOffsetMethod.Bevelled,
                          Offset = 0,
                          Option = GeometricEffectOffsetOption.Fast
                      }
                  }
              },
              new CIMVectorMarker() //circle marker
              {
                  MarkerGraphics = circleMarker.MarkerGraphics,
                  Frame = circleMarker.Frame, //need to match the CIMVector marker's frame to the circleMarker's frame.
                  Size = circleMarker.Size,    //need to match the CIMVector marker's size to the circleMarker's size.                    
                 MarkerPlacement = new CIMMarkerPlacementAlongLineSameSize()
                 {
                     AngleToLine = true,
                     Offset = 0,
                     Endings = PlacementEndings.Custom,
                     OffsetAlongLine = 15,
                     PlacementTemplate = new double[] {60},
                 }

              },
              new CIMVectorMarker() //square marker
              {
                 MarkerGraphics = squareMarker.MarkerGraphics,
                 Frame = squareMarker.Frame, //need to match the CIMVector marker's frame to the squareMarker frame.
                 Size = squareMarker.Size, //need to match the CIMVector marker's size to the squareMarker size.
                 MarkerPlacement = new CIMMarkerPlacementAlongLineSameSize()
                 {
                     AngleToLine = true,
                     Endings = PlacementEndings.Custom,
                     OffsetAlongLine = 45,
                     PlacementTemplate = new double[] {60},
                 }
              }
    };
  dash2MarkersLine.SymbolLayers = mySymbolLyrs;
}

/// <summary>
/// Create a point symbol from a character in a font file
/// ![PointSymbolFont](https://ArcGIS.github.io/arcgis-pro-sdk/images/Symbology/point-marker.png)
/// </summary>
{
  //creating the marker from the Font selected
  //Note: Run withing QueuedTask
  var cimMarker = SymbolFactory.Instance.ConstructMarker(47, "Wingdings 3", "Regular", 12);
  CIMPointSymbol fontPointSymbol = SymbolFactory.Instance.ConstructPointSymbol(cimMarker);
  //To apply the symbol to a point feature layer
  //var renderer = pointLayer.GetRenderer() as CIMSimpleRenderer;
  //renderer.Symbol = fontPointSymbol.MakeSymbolReference();
  //pointLayer.SetRenderer(renderer);
}