art clef composition concert key music note pictogram play sign sound symbol write chemistry danger eye face icon laboratory lens safe security work call communication dial hear phone rotary speak talk telephone drive ico move sled sledge snow snowmachine snowmobile snowsled symbol. pictogram tobbogan track transport vehicle winter armour armoured army artillery battle cannon gun military modern tank war weapon wheel bildtecken construction decay icons icoon ikon man oxidation paint road rust rusted rusting rusty symbool warn warning