Small antique rotary payphone dial zero fast with a return
Morse code with a weak signal, number zero
MF style telephone button beep number zero.
MF style telephone, button beeps via speaker, number zero
Morse code number zero, military
Computer voice from a Boeing 757 cockpit, 'envelope voice envelope mod B zero two'
Computer voice from a boeing 757 cockpit saying 'Aircraft type one zero five'
Computer voice from a Boeing 757 cockpit saying 'configuration software version two zero two'
Computer voice from a Boeing 757 cockpit saying 'application software version two zero two'