In Perl5, the sigil represents how the variable should be treated. It does not represent the type of the variable. So just like $ can be used by scalar, arrays and hashes, @ can be used by arrays and hashes.
|select element||select elements (slice)||all keys||all values||all keys & values|
This is all documented in perldata, including slices.
Update: Reordered the columns.
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| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||