I am using the below code to get the last column letter.
It works correctly, but I do not understand what is (0) means exactly !
According to MS documentation and code intellisense, it should be the Limit as integer
But in this case it should be inside the brackets of Split function itself like all the rest arguments

Dim lastCol_L As String
lastCol_L = Split(Cells(1, lastCol_n).Address(True, False), "$")(0)

lastCol_n is integer from other code
Thanks for all helpful answer