Reason of ampersand (&) sign before a variable name in PHP

<?php
    $number = 1;
    $pointer = &$number;
   
    echo $number."<br/>"; // outputs 1
    echo $pointer."<br/>"; // outputs 1
   
    $pointer = 2;
   
    echo $number."<br/>"; // outputs 2
    echo $pointer."<br/>"; // outputs 2
?>

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