The reference point of a symbol controls the position of a symbol over a feature in a map. The default reference point is the center of the symbol. In the standard Style Point dialog box, for Reference Point, X specifies a value for the horizontal center of the symbol. Y specifies a value for the vertical center of the symbol. For enhanced styles, this is an option in the Advanced section.
To change the reference point of a symbol for standard styles
A red box indicates the new position of the reference point. The X and Y values are updated.
The reference point is positioned at the center of the symbol.
Use In, Out, and Extents to adjust your view of the symbol as needed. To view the edges of the symbol, click Outline.