The sigil to use is the type being returned
Actually, it isn't. Here are some counter examples: 
@foo             # Number of elements of the array.
@foo             # A reference to the array.
@foo[$i, $j]     # Last element of slice.
@foo{$k1, $k2}   # Last element of slice.

%foo             # A reference to the hash.
%foo             # True/false.
%foo             # String with ratio of filled buckets and buckets.

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The sigil can influence what is returned, but foremost, it's the context that will determine what is returned. In particular, in scalar context, a scalar will always be returned.

In reply to Re^2: Scalar value @scores_sorted[$i] better written as $scores_sorted[$i] by JavaFan
in thread Scalar value @scores_sorted[$i] better written as $scores_sorted[$i] by filesurfer

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