Which HTML tag belongs in the blank in the code?

<html>
<head>
<title>List</title>
</head>
<body>
<ol type=1>
<li>Line 1</li>
<li>Line 2</li>
<li>Line 3</li>
</body>
</html>

</li>
</ol>
<ul>
</ul>

The HTML tag that belongs in the blank is `<ul>`.