JK

JK is an abbreviation for:

a model abbreviation of the Jeep Wrangler, see Jeep Wrangler #Wrangler JK
Jump / kill flip-flops , see JK flip-flop
Legal Commission, for so-called SPIO / JK reports, see age approval #Legal examinations
Just Kidding , see list of abbreviations (net jargon) #J)
Chancellor of Justice in Sweden
Spanair , Spanish airline (IATA code)
Trabajos Aéreos y Enlaces , Spanish airline (ICAO code)

JK as a distinguishing mark on license plates: