Labels
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The `d {' (`calc-left-label') command prompts for a string, then
displays that string to the left of every stack entry.  If the entries
are left-justified (See Justification), then they will appear
immediately after the label (unless you specified an origin greater
than the length of the label).  If the entries are centered or
right-justified, the label appears on the far left and does not affect
the horizontal position of the stack entry.

Give a blank string (with `d { RET') to turn the label off.

The `d }' (`calc-right-label') command similarly adds a label on the
righthand side.  It does not affect positioning of the stack entries
unless they are right-justified.  Also, if both a line width and an
origin are given in right-justified mode, the stack entry is justified
to the origin and the righthand label is justified to the line width.

One application of labels would be to add equation numbers to formulas
you are manipulating in Calc and then copying into a document
(possibly using Embedded Mode).  The equations would typically be
centered, and the equation numbers would be on the left or right as
you prefer.