is the official name of the color used for things such as hunting
jackets, construction worker
's vests, crossing guard
uniforms, and all manner or cautionary
signs, including but not limited to construction
signs, traffic cones
International orange is, as defined by the International Color Consoritium (www.color.org), fluorescent orange with a dominant wave length of 595-605 nm (a measure of light intensity), a purity of not less than 85 percent and a luminance factor of not less than 40 percent. There are many regulations concerning the shade of orange used on these items, as well as other aspects such as reflectibility (on vests and signs, retroflective tape or film is used), which shade to use if the object is going to be outside during the day, which to use at night, and so on.
International orange is usually called fluorescent or Day-glo orange by the un-enlightened.