JK

just kidding.

Origin of JK

From its use in digital communications

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

JK Rowling, Adele and Victoria Beckham also make the cut in the list compiled for the BBC radio show Women's Hour.
Kate Middleton? Nah, She's Not Powerful At All...|Tom Sykes|February 12, 2013|DAILY BEAST
A number of famous celebrities, including JK Rowling and Oprah Winfrey have taken up their cause.
Scotland Yard Says Madeleine McCann May Still Be Alive|Barbie Latza Nadeau|April 26, 2012|DAILY BEAST
JK: Sho, how would you describe the issues between the two of you?
TV's Funniest Frenemies|Jessi Klein|July 14, 2009|DAILY BEAST
JK: Do you think Michael and Michael Have Issues has any chance at being as compelling as Real Housewives of New Jersey?
TV's Funniest Frenemies|Jessi Klein|July 14, 2009|DAILY BEAST

I asked JK if it was cool for me to play one his acoustic guitars.
First Day Out of Prison|John Forté|January 26, 2009|DAILY BEAST
The optional link (JK of fig. 7e) was used in the engines as built.
Kinematics of Mechanisms from the Time of Watt|Eugene S. Ferguson
As the optional link JK held the gearwheel centers always equidistant, the annular guide G was not used.
Kinematics of Mechanisms from the Time of Watt|Eugene S. Ferguson