ColumnLabels

is an option for StemLeafPlot that specifies the labels for columns.

Details and Options

To use ColumnLabels, you first need to load the Statistical Plots Package using Needs["StatisticalPlots`"].
Valid settings for the option ColumnLabels are Automatic or a list of labels.
With the default ColumnLabels->Automatic, the stem column is labeled Stem, leaf columns are labeled Leaves, and count columns are labeled Counts.
With the setting ColumnLabels->{label₁,label₂,…}, the number of labels should match the number of columns, with labels placed on the plot sequentially from left to right.

Label stem and leaf columns with "S" and "L":

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