OpenOffice Calc is a spreadsheet application similar to Microsoft Excel.
The topmost bar of any application window is usually the Title Bar.
The Title Bar displays the name of the file and the application name.
Below the Title Bar is the Menu Bar, which contains drop-down menus like File, Edit, View, etc.
The Standard Bar and Formatting Bar are toolbars located below the Menu Bar.
Therefore, the bar located at the very top of the Calc window is the Title Bar.