Final answer:
Sound signalling equipment is used to communicate important information through the use of auditory signals. They are used in various industries and situations, such as marine navigation, road traffic control, and emergency alerts.
Step-by-step explanation:
Sound signalling equipment is used to communicate important information through the use of auditory signals. These signals can be in the form of words, alarms, sirens, or other distinct sounds. They are important in various industries and situations, such as marine navigation, road traffic control, and emergency alerts. For example, in marine navigation, ships are equipped with horns or sirens to communicate with other vessels and to warn of their presence. In road traffic control, traffic lights use sound signals in the form of beeps or clicks to assist visually impaired pedestrians. Emergency vehicles are also equipped with sirens to alert drivers and pedestrians to their presence and to indicate the need for them to clear the way.