A12 (Warning—Rockfall) is a Swedish road sign, belonging to the category of warning signs (group A). Closer provisions are given in the road sign ordinance (SFS 2007:90): The sign warns about a risk of rockfall and indicates that rocks may be present on the road due to rockfall. The symbol shall be adjusted according to the local conditions of whichever place the sign has been mounted at. The variant A12-1 indicates that potential rockfall would come from the right side of the road.
transportstyrelsen.se 



Source materials for this file are available from Commons Archive:

Sweden road sign A12-1.eps
Government of Sweden