Скачать или смотреть Developer's tutorials: Perl 04: Array variables and scalar values

In Perl, It is surprising to find the $ used on arrays. It's easier to understand by thinking about it like this. When referring to a single value, you always use a $. If it is multiple values you use the @ symbol.

use v5.42;

my @scores = (72,95,86,82,79);

single value
say "First score is $scores[0]";
say "Last score is $scores[-1]";

multiple values
say "The whole array is @scores";

When we speak of a single string or number, for example, this is known as a "scalar". Scalar always means "one of".

Notice that the array "scores" with subscript zero is a scalar and is named with a $. Even though it is part of the array, it is still a scalar, or a single value. Since it refers to a single value, it must be named with a $.