<<>> are brackets indicating that this is a merge field--a non editable copy of the field that can merge it's data with layout text included in the same text block. You can look up "merge field" in Filemaker help if you need to know more.
Shipping Address for Order::
Identifies a table occurrence in your relationships graph. Look for a box in Manage | database | Relationships with this exact name and study how it links to the table occurrence box specified in Show Records From in Layout Setup.. for this layout to see how the relationship controls what data appears on the layout. You may need to hover the mouse over the upper left corner of Shipping Address for Order in order to get the name of it's data source table--a name you can select in the table drop down on the Fields tab to see what fields have been defined for that table and where you'll find a field named "state".