Making your website RSS friendly and giving your readers/customers easy ways to subscribe to your content are crucial elements to marketing yourself.
Clearly identifying your RSS feed with Feed Icons is important. The standard for a web feed icon is this:

This standard helps to eliminate confusion, clearly identify your RSS feed and make your content [...]

Picture from Rogers Cadenhead:

It’s time for a universal icon to be adopted.  If Microsoft can adopt Mozilla’s feed button, the least we can do is do the same.  (via)