A geocoin is a uniquely numbered object that is hidden in geocache. A geocoin is usually round and coin-sized, but some types of geocoins are shaped to match a theme (the shape of a state, for example). Geocoins are often decorative or commemorative, making them collectible. Geocoins are similar to travel bugs, which also carry unique identifying numbers. When you find a geocoin or travel bug in a geocache, you have two options:
-Remove the geocoin or travel bug from the cache. You may take it home, or drop it off in another cache (write down its number first) if you are hunting multiple caches. It can be especially worthwhile to take a geocoin or travel bug with you if you plan to travel a significant distance after retrieving it and can "help" it in its travels.
-Leave the geocoin or travel bug in the cache. If you won't be visiting another geocache soon, simply write down the number(s) of the geocoins and/or travel bugs in the cache.
Whether you remove the geocoin or travel bug, or leave it in the cache, you may look it up by its unique identifier on geocaching.com and learn where it originated and where it has traveled.
Good geocaching etiquette means reporting all geocoin and travel bug removals and placements, and not holding on to them for too long (keeping them in circulation).