It's either a ring control or enum (enumerated type). When you create one, you enter text as items to be displayed. The actual value of the control is the index of the selected item. For example, say a,b,c are the available items - these represent values 0,1,2. The operator chooses b. The value returned from the control is 1. Enums are great because if you wire one to a case structure, the text represnetation of the enum is displayed in the case - making documentation easier. If you actually need the text values, create a property node. The property Strings[] will return 1D array of all of the available strings. The property RingText.Text will return the string value of the currently selected item. There is considerably more information available on ring
s and enums in the LabVIEW User Manual and on-line help.