Ancla
From Joomla! Documentation
An anchor is created using the <a> tag in HTML. An anchor allows you to place a bookmark inside an HTML page. In Joomla!, you can place an anchor inside an article (for example, using the TinyMCE editor). This lets you create a link that will go directly to that point in the article.
El código fuente HTML de un ancla tiene la siguiente estructura:
<a name="mi_ancla" title="Mi Ancla"></a>
Puedes enlazar con un ancla desde la propia página usando el código HTML
<a href="#mi_ancla" ></a>
Al pinchar en ese enlace te llevará directamente a donde se encuentre la etiqueta del ancla.
You can link to an anchor in a different page by appending "#" plus the anchor name to the end of the URL. In the example above, if the URL for the article was http://www.mysite.com/my_article.html, then you could link directly to the anchor in that page with the URL http://www.mysite.com/my_article.html#my_anchor.