size

The size of marker symbol layer. The input value can be any positive number. The default value is 13.333 device-independent pixels (DIPs), equivalent to 10 points. A larger size means a larger marker.

The measurement unit for this property is in DIPs by default. To use meters to render 3D markers with real-world dimensions (meters) instead, set the MultilayerSymbol.sceneSizeUnit property to SymbolSizeUnits.Meters. This switches the interpretation of the size from DIPs to meters.