PROC CHART ignores NOSYMBOL if you omit SUBGROUP=.
SUBGROUP=variable
subdivides each bar or block into characters that show the contribution of the values
of variable to that bar or block. PROC CHART uses the first character of each value
to fill in the portion of the bar or block that corresponds to that value, unless more
than one value begins with the same first character. In that case, PROC CHART uses
the letters A, B, C, and so on, to fill in the bars or blocks. If the variable is formatted,
then PROC CHART uses the first character of the formatted value.
The characters used in the chart and the values that they represent ...
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