Shear Thickening Fluids (STFs) may be “liquid” in a strict sense – but they’re used in fabrics. Developed by Professor Norman Wagner and his research team, including students, of the University of Delaware, as a joint project between the University of Delaware Center for Composite Materials and the United States Army Research Lab. They’re amazing [...]
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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.