The Geotag Icon is intended as a web "standard" icon for identifying geotagged content to humans.
The advent of inexpensive GPS devices and free tools like Google Maps or Flickr Map mean that more and more people are associating their content (typically blog posts or photos) with a specific geographic location. Such "geotagging" stores coordinates within metadata or microformat tags—where machines can find them but people can't.
That's where the Geotag Icon comes in. It provides a visual reference to a map link, or if no link is yet made helps viewers recognize the geographic relevance of the content.
It's free, easy to use and helps us all visualize the developing semantic web.