The <dl>, or description list, element is underrated.

It's used to represent a list of name–value pairs. This is a common UI pattern that, at the same time, is incredibly versatile. For instance, you've probably seen these layouts out in the wild…

<dl>
    <dt>Title</dt>
    <dd>Designing with Web Standards</dd>
    <dt>Publisher</dt>
    <dd>New Riders Pub; 3rd edition (October 19, 2009)</dd>
</dl>