A sheet in a Numbers document, can be thought of as the equivalent of a page in a layout application’s document. A sheet can contain tables, images, videos, or any of the other data types supported by Numbers.
The Numbers 2009 Compatibility Suite supports tables as the only scriptable element of a sheet. Note that the sheet class has a single property “name”, whose value is the title of the sheet.
sheet n : A sheet in a document
contains tables; contained by documents.
name ( text ) : The sheet’s name.
delete, exists, make