This is the standard RSS feed icon: 
Usage Guidelines
The feed icon should be used to indicate the presence of information provided via web syndication in an open format, including in particular the widely-used RSS 1.0, RSS 2.0, and Atom 1.0 formats.By web syndication we mean a process in which content items from a web site or other source (e.g., news stories or blog posts or summaries thereof) are made available for other sites or applications to use, typically using an XML-based document format transferred using the HTTP protocol.
By open format we mean a format that is:
* defined by a published specification
* free of legal restrictions on use, especially restrictions that would prevent the format from being implemented by free and open source software
* developed and/or maintained through an open process
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