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===Applications for the general public===
[[File:SOS.svg|thumb|left|250px|Representation of Morse code '''{{overline|SOS}}''']]
An important application is signalling for help through [[SOS]], "{{morse|dot|dot|dot|dash|dash|dash|dot|dot|dot}}". This can be sent many ways: keying a radio on and off, flashing a mirror, toggling a flashlight, and similar methods. The [[SOS]] signal is not sent as three separate characters; rather, it is a [[prosigns for Morse code|prosign]] {{sc|'''{{overline|SOS}}'''}}, and is keyed without gaps between characters.<ref name=QSL-Prosigns/> The specific meaning of the {{sc|'''{{overline|SOS}}'''}} prosign is equivalent to "This is the start of a distress message" (all other transmissions to go silent for the duration of the message).
===Morse code as an assistive technology===
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