The sigil to use is the type being returned. 

$foo             # Scalar
$foo[$i]         # Array element, a scalar
$foo{$k}         # Hash element, a scalar

@foo             # Array contents, a list of scalar values
@foo[$i, $j]     # Array slice, a list of scalar values
@foo{$k1, $k2}   # Hash slice, a list of scalar values

%foo             # Hash contents, a list of key-value pairs

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$foo[EXPR] and @foo[EXPR] differ in the context in which EXPR is evaluated, and they differ in the number of scalars they can return.

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

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