The tag is <ol>…</ol>
The ordered list is a container tag and is used for numbered lists.
Here is an example of the ordered (numbered) list goes like this:
<ol>
<li>My first item on the list.</li>
<li>My second item on the list.</li>
<li>My third item on the list.</li>
<li>My fourth item on the list.</li>
</ol>