Wiktionary
n. A reddish-orange colour used to set things apart from their surroundings.
Wikipedia
International orange is a color used in the aerospace industry to set objects apart from their surroundings, similar to safety orange, but deeper and with a more reddish tone.
Usage examples of "international orange".
The bright yellow or international orange jackets and parkas, it seemed, drew far too much fire.
The chute had alternating white and international orange panels and stood out clearly against yellow and red leaves where it hung in a stand of aspens.
The floor might be stone, the ceiling hewn beams and the leather-clad men and women dragon riders, but it was still a pilot's meeting place and Charlie fit right in, international orange flight suit and all.
A soft-edged star, bright international orange, radiated from the welfare bundle's impact point.