From OpenStreetMap Wiki
|historic = tree_shrine|
|A tree with a religious image on it|
|Used on these elements|
|Tools for this tag|
|This tag has not been voted and is not used a lot (currently 82 global uses), it should be taken with a grain of salt. Normally this should be in the proposal namespace of the wiki!|
|Use natural=tree + historic=wayside_shrine instead.|
A historical religious image (usually containing Jesus, virgin Mary or other important holy figures) in a sort of container mounted on a tree. Frequently found along the way in Austria.