RSS (Really Simple Syndication) is a family of web data formats used to publish frequently changing content, such as lists of upcoming events. Through an RSS reader or "aggregator", you can subscribe to any number of RSS feeds and have access to all of them in one convenient location.

There are many RSS aggregators available. Some aggregators are presented as specialized, customizable websites and can be used with most web browsers. These include Google Reader, My Yahoo and Bloglines, and typically require signing up for a free service. Other aggregators operate as extensions to the web browser itself, such as Firefox's Live Bookmarks. The Mozilla Thunderbird email reader allows you to create RSS accounts that look and behave much like email accounts. Still other aggregators take the form of stand-alone programs, some of which are free, others of which are not.

This symbol indicates the presence of an RSS feed. Clicking on it will typically cause your web browser to prompt you to subscribe to the feed. Exactly how this happens and what subscription options you'll have depends on your browser or email reader, its configuration and your computer's operating system or work environment. There are many sources of information (such as this one) where you can learn more about RSS feeds and how to use them, and find tips on selecting an RSS reader.