UNE-EN 981:1997

1 Scope
2 Normative references
3 Definitions
4 Ergonomic principles for the design and application of
    auditory and visual signals
    4.1 General
    4.2 Principles for distinctive characters
    4.3 Qualities of auditory signals
    4.4 Qualities of visual signals
5 System of auditory and visual signals
    5.1 Scheme of auditory and visual signals
    5.2 Scheme of auditory signal character
    5.3 Scheme of visual signal colours
6 Testing
Annex
ZA (informative) Clauses of this European Standard addressing
    essential requirements or other provisions of EU
    directives
Tables
1 Signals for general purposes, listed after degree of
    urgency
2 Character of signals for public alarm
3 Scheme for character of auditory signals
4 Scheme for colours of visual signals
2

Defines a system of danger and information signals, allowing for different degrees of urgency. Applies to all danger and information signals requiring to be clearly perceived and differentiated as in 5.3 of EN 292-2.