Usually a hash ref, perhaps like this:
$record = {
NAME => "Jason",
EMPNO => 132,
TITLE => "deputy peon",
AGE => 23,
SALARY => 37_000,
PALS => [ "Norbert", "Rhys", "Phineas"],
};References are documented in perlref and the upcoming perlreftut.
Examples of complex data structures are given in perldsc and
perllol. Examples of structures and object-oriented classes are
in perltoot.