"CQD (transmitted in Morse code as ▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄) is one of the first distress signals adopted for radio use. On 7 January 1904 the Marconi International Marine Communication Company issued "Circular 57", which specified that, for the company's installations, beginning 1 February 1904 "the call to be given by ships in distress or in any way requiring assistance shall be 'C Q D' ".[1]"
https://en.wikipedia.org/wiki/CQD
Hmm.
Cybersecurity expert Dan Kaminsky dead at 42
“While his passing was sudden and unexpected for us, Dan struggled for years with diabetes and was even recently hospitalized because of it,” according to the niece, whose message was posted in a tweet on Sunday.
At the same time, she sought to quash speculation that Kaminsky’s passing was related to the coronavirus vaccine that Kaminsky tweeted about receiving on April 12.
https://nypost.com/2021/04/26/cybersecurity-expert-dan-kaminsky-dead-at-42/