The Dummy Object is one of many Helper Objects:

Attributes

• Icon Size - The size of the icon, in world units.
• Use Custom Icon - Allows a custom icon to be associated with the dummy. Once this icon is selected, the file is no longer needed.
• Use Default Icon - Resets the icon to be the default.
• Always Face View - Indicates whether the icon should always face the view. This is commonly used when using a 2D custom icon.
• Text - Text caption to display in the viewports.
• Icon Color - The color of the icon in the viewports.