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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>selector — DOM node</title>
  <style>
    pre { font-family: ui-monospace, monospace; font-size: 13px; }
    #box { padding: 12px; background: #fef3c7; border: 1px solid #f59e0b; }
  </style>
</head>
<body>
  <div id="box">Hello</div>
  <pre id="out"></pre>
  <script src="https://code.jquery.com/jquery-1.12.4.min.js"></script>
  <script>
    var el = document.getElementById("box");
    var $fromSelector = jQuery("#box");
    var $fromNode = jQuery(el);
    document.getElementById("out").textContent = [
      "From selector $("#box"):",
      "  selector: "" + $fromSelector.selector + """,
      "",
      "From DOM node jQuery(el):",
      "  selector: "" + $fromNode.selector + """,
      "  (often empty — no query string was passed)"
    ].join("\n");
  </script>
</body>
</html>

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.selector — Empty When Wrapping a DOM Node (Try It)