If your page is signed in the cell A 1 and you want to quote the cell A3 labeled A 1, you can write it as indirect (A1&; "! a3”)
Supplement to your question: I can't explain this, this is its grammatical rules, tag name! Cells, you can see these rules for yourself. For example, if you enter an = in the SHEET 1 table and click a cell in SHEET2 with the mouse, you will know how it is represented in the formula bar, and you can also view it in this way across workbooks.
Example: if you want to calculate the sum of cells in SHEET 1 table A 1:A 10, you can use the formula = sum (SHEET2! A 1:A 10)