In this Chapter:
"acoustic signal" means a coded sound signal which is released and transmitted by a device designed for that purpose, without the use of a human or artificial voice;
"emergency escape or first-aid sign" means a sign giving information on emergency exits or first-aid or rescue facilities;
"hand signal" means a movement, position, or both, of the arm, hands, or both, in coded form, for guiding persons who are carrying out manoeuvers which constitute a hazard or danger for persons at work;
"illuminated sign" means a sign produced by a device made of transparent or translucent materials which are illuminated from the inside or the rear in such a way as to give the appearance of a luminous surface;
"information sign" means a sign providing information other than that referred to in prohibition, warning, mandatory or emergency escape or first-aid signs;
"mandatory sign" means a sign requiring specific behaviour;
"prohibition sign" means a sign prohibiting behaviour likely to
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