How to refer to the most bottom right cell?

{Z100:100} will select 1 row start from cell Z100 all the way to the right.

{Z100:Z} will select 1 column start from cell Z100 down to the bottom.

What about if i want to refer the most bottom-right cell in simple way?For example select all range starts from cell Z100 until to whatever the bottom right cell is.

{Z100:? }