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Annex I to Protocol Additional I to the Geneva Conventions of 1949 : Regulations concerning identification, as amended on 30 November 1993.
International distinctive sign
Article 16 - International distinctive sign
1. The international distinctive sign of civil defence provided for in Article 66, paragraph 4, of the Protocol is an equilateral blue triangle on an orange ground. A model is shown in Figure 4:
2. It is recommended that:
(a) if the blue triangle is on a flag or armlet or tabard, the ground to the triangle be the orange flag, armlet or tabard;
(b) one of the angles of the triangle be pointed vertically upwards;
(c) no angle of the triangle touch the edge of the orange ground.
3. The international distinctive sign shall be as large as appropriate under the circumstances. The distinctive sign shall, whenever possible, be displayed on flat surfaces or on flags visible from as many directions and from as far away as possible. Subject to the instructions of the competent authority, civil defence personnel shall, as far as possible, wear headgear and clothing bearing the international distinctive sign. 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.