This component is based on the ASCII table, if the number received is 2 it will return B.
Imagine this scenario: you have a large Excel file and you know that one of the fields that you need in your DataTable is in the index 208. You need to write in the Excel file with the activity WriteCell and you need the correct coordinate. You just need to include this activity, pass the index and you will get HA as your Excel coordinate to write in the correct cell.
As an option, you can use column number instead, just remember that the index is zero based.
Easly convert Excel column number to Excel header letters.