(c) safety colour – a colour to which a specific meaning is assigned (eg yellow
means ‘be careful’ or ‘take precautions’);
(d) symbol or pictogram – these appear in Schedule 1, although some variation
in detail is acceptable provided the meaning is the same. They are for use on
a signboard or illuminated sign (eg the trefoil ionising radiation warning sign);
(e) illuminated sign – a sign made of transparent or translucent materials which
is illuminated from the inside or the rear to give the appearance of a luminous
surface (eg many emergency exit signs);
(f) acoustic signal – a sound signal which is transmitted without the use of a
human or artificial voice (eg fire alarm);
(g) verbal communication – a predetermined spoken message communicated
by a human or artificial voice;
(h) hand signal – a movement or position of the arms or hands giving a
recognised signal and guiding persons who are carrying out manoeuvres
which are a hazard or danger to people;
(i) fire safety sign – see paragraph 88.