calc: Labels

 
 7.7.10 Labels
 -------------
 
 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 (SeeJustification), 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.