abrv. Short for Jeet Kune Do/Jun Fan Jeet Kune Do. JKD is not a martial arts style, butmore of a psychology or way of thinking which can be applied to any martial art and most fighting forms.
"teach a man a block and he can perform that block, but teach him the concept behind the block, and he can apply this to a whole range of blocks. That is Jeet Kune Do." -Bruce Lee