MS Excel
Excel uniquely identifies cells within a worksheet with a cell name

Column numbers and row letters
Cell names
Column letters and row numbers
Cell locator coordinates

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MS Excel
How do you delete a column?

Select the row heading you want to delete and select Edit>Delete from the menu
Select the column heading you want to delete and select the Delete Row button on the standard toolbar
Right click the column heading you want to delete and select delete from the shortcut menu
Select the column heading you want to delete and select Insert Delete from the menu

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