Warning sounds are signals used to alert people of potential danger. The most common warning sounds include signals, SIRENS, alarms, and tocsins. Signals are short, sharp sounds that are used to draw attention to a situation. SIRENS are loud, wailing sounds that are used to indicate an emergency. Alarms are loud, continuous sounds that are used to alert people of danger. Tocsins are bells that are rung to warn people of danger.