Hazard Symbol 25 and Black Circle in Triangle - Safety Signage Guide #318684 (License: Personal Use)

The left symbol shows a triangle containing the number “25” enclosed in a circle, representing UN Class 2.1 flammable liquids under transport regulations. The right symbol features a solid black circle centered within an equilateral triangle, commonly used to denote prohibition, restriction, or a mandatory action zone in industrial safety signage.

Used on chemical containers, transport vehicles, safety data sheets, and facility signage to communicate hazards and restrictions; matches user intent for regulatory compliance, safety training, or hazard identification.