Content placeholders in Joomla!
With Snippets you can include text snippets in your content
You can make reusable snippets (pieces of text/content) and easily include them into your content via a simple tag, like:
Have a text snippet or a sentence you use often? Prepare it once, then simply insert it in articles with one click.
The great thing about Snippets is that when you change the content of a snippet, the output changes automatically in every place where you have used the tag!