Warning signs warn of a potential hazard or a hazardous condition that is possibly life threatening. The hazard symbol is illustrated in black encased in a triangle on a yellow background with black text underneath. You will always find the right caution/warning safety signage at RSEA Safety Online with our variety of options including poly, metal, stickers & more. Can't find what you need? We also create custom signage in different sizes, colours & materials. Call us on 132 100 for more information.