Combine the GameObject's Mesh with other eligible Meshes, to potentially reduce runtime rendering costs.
For more information, see the documentation on Static Batching. Note that you can use StaticBatchingUtility.Combine to combine Meshes that do not have this StaticEditorFlag enabled at runtime.
void StaticEditorFlagsExample(){
// Create a GameObject
var go = new GameObject("Example");
// Set the GameObject's StaticEditorFlags
var flags = StaticEditorFlags.BatchingStatic;
GameObjectUtility.SetStaticEditorFlags(go,flags);
}