Apple iWork '08 - Manual (Page 61)

Chapter 2 Getting Started with Numbers 61
When a cell is selected, its border is highlighted. Also, reference tabs appear around the
outside of the table. You can use the reference tabs to refer to cells in formulas, select
entire rows and columns, and more, as you’ll see throughout this tutorial.
When a cell is selected, you can use the Table handle in the upper-left corner to select
or move the table.
Reference tab numbers
refer to rows.
Reference tab letters
refer to columns.
Click the Table handle to select
the table. Drag the handle to
move the table.
The border of the
selected cell is
highlighted.