  hazard symbols are recognizable symbols designed to warn about hazardous materials, locations, or objects, including electric currents, poisons, and other things. the use of hazard symbols is often regulated by law and directed by standards organizations. hazard symbols may appear with different colors, backgrounds, borders and supplemental information in order to specify the type of hazard. ==types of hazard symbols== {| class="wikitable" style="text-align:center" |- !name hazard symbol !symbol !unicode !image |- |general caution||â¡||u+2621||80px |- |toxic sign||â ||u+2620||80px|skull and crossbones |- |ionizing radiation sign||â¢||u+2622||80px|radioactivity |- |radiation danger - high level sources sign||?||?||80px|radioactivity |- |non-ionizing radiation sign||?||?||80px|radiowave |- |biohazard sign||â£||u+2623||80px|biohazard |- |warning sign||â ||u+26a0||80px|warning |- |high voltage sign||â¡||u+26a1||80px|high voltage |- |chemical weapon symbol||?||?||80px|chemical warfare |- |laser hazard sign||?||?||80px|a typical laser warning symbol |- | colspan="4" |more hazard signs can be found on the list of din 4844-2 warning signs |} ==poison sign==  thumb|left|65px|alt=skull and crossbones|skull and crossbones the skull-and-crossbones symbol (â ), consisting of a human skull and two bones crossed together behind the skull, is today generally used as a warning of danger, particularly in regard to poisonous substances. the symbol, or some variation thereof, specifically with the bones (or swords) below the skull, was also featured on the jolly roger, the traditional flag of european and american seagoing pirates. it is also part of the canadian whmis home symbols placed on containers to warn that the contents are poisonous. in the united states, due to concerns that the skull-and-crossbones symbol's association with pirates might encourage children to play with toxic materials, the [[mr. y
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