XlSheetVisibility Enumeration

Excel Developer Reference

Specifies whether the object is visible.

Version Information
 Version Added:  Excel 2007

Name Value Description
xlSheetHidden 0 Hides the worksheet which the user can unhide via menu.
xlSheetVeryHidden 2 Hides the object so that the only way for you to make it visible again is by setting this property to True (the user cannot make the object visible).
xlSheetVisible -1 Displays the sheet.