TableHeadings is an option for TableForm and MatrixForm which gives the labels to be printed for entries in each dimension of a table or matrix.
TableHeadings -> None gives no labels in any dimension.
TableHeadings -> Automatic gives successive integer labels for each entry in each dimension.
TableHeadings -> , , ... , ... gives explicit labels for each entry.
The labels can be strings or other Mathematica expressions.
The labels are placed as headings for rows or columns.
See Section 2.9.8.
New in Version 2.