Abstract. By burning fossil fuels we have put 3.6 trillion tons of Carbon Dioxide, CO2 in the atmosphere1 in the last 200 years – most in the last 60. This has changed the concentration of atmospheric CO2 from 270 parts per Million, ppm, to 390 ppm, an increase of approximately 31%. This increase of atmospheric [...]
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The same messages can be communicated by signalling the letter "K" in Morse code via signal lamp. (While a proper signal lamp may be ideal, a flashlight, probably best employing red LEDs, will certainly fit the bill).
In Morse, the letter "K" is represent as Dash - Dot -- Dash.
The ICS also has a subset, the Medical Signal Code, which uses three-character phrases to communicate brief medical messages.