The ab button, with the diagonal arrow from the bottom left to top right, is the Orienation button. It allows you to do things like slant your text or make it vertical.
AB de Villiers excels in the sport of cricket.
The horizantal lines
There is no formula error button in Excel. However, there is an Error Checking button on the Formulas ribbon in the Formula Auditing section in Excel 2007.
Excel 2003 and older: File menu button Excel 2007 and newer: MS Office button (circle at top left of window)
The Offic Button in Excel.
In Excel 2007, use the "Format as Table" button in the Styles section of the Home tab.
You use the sum button in excel when you want to add numerous amounts of numbers.
Toggle button
it shows the layout
Yes there is.
Close Button
In a small pop-up window above the button.