An Excel spreadsheet is called a workbook. Each individual page is called a worksheet.
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It defaults to Sheet1 in the open workbook which is Book1.
It is normally called Book followed by a number, which will depend on how many new files have been opened. So it would be Book1 for the first file. If you save it, it will be come Book1.xlsx or Book1.xls in older versions, unless you give it a new name, which you should always do.
The default file name for all versions of Microsoft Excel is called "book1"
An Excel work book is generally called Book1 before it is named. If there are multiple sheets that have not been named, they will be named the next available number, for example one could have and Book1 and Book2.
After the launch process has completed you will see a blank worksheet called Book1 on the screen.
As Excel starts you will see the words Microsoft Excel in the title bar. After a few seconds the first worksheet will appear and then in the title bar a hyphen and Book1 will also appear beside Microsoft Excel. So what you will see is this: Microsoft Excel - Book1
A blank workbook called Book1.xls with 3 worksheets and opened on Sheet1.
Chapter 2 of Artemis Fowl, book 1, is called 'Translation'.
The default file name for an MS Excel workbook is book1. I suppose because the programmer decided book made sense for a workbook and the 1 represents the first one you save. You can change the file name to whatever you like.
A workbook in Excel will be Book1.xlsx for versions from Excel 2007 onwards, or Book1.xls for earlier versions.
I believe it is Book1