Yes they are identified using letters.
The columns appear vertically in a worksheet, and are identified by letters at the top of a worksheet window.
Columns are identified by letters.
Rows are horizontal and numbered; columns are vertical and lettered.
columns
columns
You can enter data in any columns you like.
Column is the term used to describe a vertical line of cells. Columns are identified by letters at the top of the worksheet page.
by numbers on the left side of the screen
Columns are identified by letters. After Z the next one is AA, then AB then AC and so on. After AZ comes BA, then BB, then BC and so on. Rows are identified by numbers. Where a row and column meet you get a cell, which is identified by its column letter and row number. So the cell where Column D and row 14 meet would be cell D14.
What naming scheme identifies the columns of the worksheet
Columns are referenced by letters.