It is the name box, with will show the address of cells and also names given to cells or ranges.
There is always one active cell. Its address will be displayed in the Name box, or the name of a named cell or named range. If a named range is selected, there is still only one active cell, but the name of the range will be shown in preference to the active cell's address.
As you type, Excel displays the entry in the FORMULA BAR, and also displays the active cell reference int he Name box on the left.
It displays contents of the active cell.
The Name box.
The cell address (or name) window is above the worksheet (usually below the menu bar). When you click on a cell, you will see either the cell address (e.g. A3) or cell name (e.g. Total; if you assigned a cell name).
In the Name Box, which is at the left end of the Formula Bar.In the Name Box, which is at the left end of the Formula Bar.
Name Box
name box
The active cell in a spreadsheet or table is typically highlighted or outlined with a bold border to distinguish it from other cells. This helps users easily identify which cell they are currently working on or editing. Additionally, the active cell may have a different background color or be surrounded by a selection box to further emphasize its status.
area near the top of the worksheet window that displays the contents of the active cell
The name box displays the name or cell reference of the active cell.
The Formula Bar.