Morse code is a way of transmitting texts by a series of dots and dashes, lights, or clicks. They can be identified by a skilled listener or observer. Morse code can be used for emergencies. The international signal for SOS is ooo---ooo (o is dot).
Morse code has been employed as an assistive technology, helping people with various disabilities communicate. Morse can be sent by people with severe motion disabilities, as long as they have minimal motor control.