advice alert appropriate behavior appropriate behaviour black blue care chinese colors colours concern danger dangerous directions emergencies emergency english languages protect protection rain rain-drops safety sign signs slip slippery slippery floor slippery surface slipping warning warning sign wet wet surface white yellow caution cutout floor information isolated pictogram warn water wet floor fungi fungus jack mushroom mushrooms sricky bun Suillus luteus climb climber glacier ice mountaineer norway sport cold crack crevasse gully mountain backet pick up basket break broken fissure fracture nature