158. 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 incur or cause danger;

“safety colour” means a colour to which a specific meaning is assigned;

“safety or health signs” means signs referring to a specific object, activity or situation and providing information or instructions about safety, health, or both, at work by means of a signboard, a colour, an illuminated sign, an acoustic signal, a verbal communication or a hand signal;

F32[…]

“signboard” means a sign which provides specific information or instructions by a combination of a geometric shape, colours and a symbol or pictogram, without written words, which is rendered visible by lighting of sufficient intensity;

“supplementary signboard” means a signboard used together with one of the signs covered by the definition of “signboard” and which gives supplementary information, including where appropriate, information in writing;

“symbol or pictogram” means a figure which describes a situation or requires specific behaviour and which is used on a signboard or illuminated surface;

“verbal communication” means a predetermined spoken message communicated by a human or artificial voice;

“warning sign” means a sign giving warning of a hazard or risk.