There are lots of trackable items that get passed around in geocaches. Some of them are called geocoins, travelbugs, and pathtags. I finally found my first one of these Friday. It is called a pathtag. The general concept is that a person customizes a little coin and buys them in bulk (like 50 or 100 of them). They come with an engraved identification number that you can enter into the website pathtags.com. It then shows all the people and places where these tags have been found.
The tags that people order are designed by the person making the order. The graphics on the coin are personalized and mean something to the person that made the tag. The person then places the tags into caches for others to find and either keep or pass on by putting in other caches if they don't collect them.
I am thinking of collecting pathtags (some of the other trackables aren't meant to be kept--you are supposed to move them on--but pathtags can be kept and collected). Here is my first one:
