Liz Borkowski at The Pump Handle posts on evidence of violence against ER nurses: n a national survey by the Emergency Nurses Association, more than half of emergency-department nurses reported that they’ve been physically assaulted on the job. For many nurses, being assaulted is a recurring problem: Approximately one-fourth of the 3,465 respondents reported experiencing [...]
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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.