What is the significance of the J and K terminals on the J-K flip-flop?

• There is no known significance in their designations.
• The J represents "jump," which is how the Q output reacts whenever the clock goes HIGH and the J input is also HIGH.
• The letters represent the initials of Johnson and King, the co-inventors of the J-K flip-flop.
• All of the other letters of the alphabet are already in use.