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Annex I (to Protocol Additional I to the Geneva Conventions of 1949) : Regulations concerning identification, 6 June 1977
International special sign
-- International special sign
1. The international special sign for works and installations containing dangerous forces, as provided for in Article 56, paragraph 7
, of the Protocol, shall be a group of three bright orange circles of equal size, placed on the same axis, the distance between each circle being one radius, in accordance with Figure 5 illustrated below.
2. The sign shall be as large as appropriate under the circumstances. When displayed over an extended surface it may be repeated as often as appropriate under the circumstances. It shall, whenever possible, be displayed on flat surfaces or on flags so as to be visible from as many directions and from as far away as possible.
3. On a flag, the distance between the outer limits of the sign and the adjacent sides of the flag shall be one radius of a circle. The flag shall be rectangular and shall have a white ground.
4. At night or when visibility is reduced, the sign may be lighted or illuminated. It may also be made of materials rendering it recognizable by technical means of detection.
International special sign for works and installations containing dangerous forces
Commentary of 1987