Picked up this Utilikey 6-in-1 tool at one of the local outlets of the Container Store. It weighs half an ounce (0.5 oz; 14 mg.) and has six features: – Flat Screwdriver – Phillips Screwdriver – Micro Eyeglass Screwdriver – Straight Blade Knife – Serrated Blade Knife – Bottle Opener It locks and unlock easily, [...]
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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.