Caption
From SmartWiki
A Caption is the text used to identify a field.
For Custom Fields the Caption setting is used if you want to have a label for the field that is different than the field name. If the caption is not set, then the field name will be used as the caption.
In the case of a Built-in Field the caption can only be changed on External Pages.
See also
How do I display the field beneath the field's label/caption?
