collection of warning signs: high voltage, vintage tin, internet security, grunge stamps, and stop signs

warning danger risk symbol caution attention hazard isolated alert traffic arrow streetsigns exclamationmark accident safety security peril red icon signage notify prevent forewarn flag triangle skull bones warningsign isolatedsign redtriangle hazardicon toxic poison emblem redalert care heed notice signal watch critical alertness beware protect guard obstacle barrier indicator road alarming dangersign warningicon threat menace cautionary vigilant unsafe perilous jeopardy advisory hazardsign