Cells are specified by the letter-number combination of their position
in the table, for example ``A5''. Note that the columns are labelled
``A-Z'' and then to the right of that ``a-z'' (lowercase).

There are also the wildcards '*' and '#' which are used in ranges (see
\ref{Spreadsheet_Ranges}), templates (see
\ref{Spreadsheet_Template_Row}), and symbolic names (see
\ref{Spreadsheet_Symbolic_Names}).