Beyond the Nunchucks, an argument could be made for his signature sound or his aloha styled fists but none are as instantly recognizable as that yellow & black Jumpsuit. Just the mention of movies like Kill Bill or Shaolin Soccer should bring to mind why, but let me share with you a little thing I did which predates both.
Wude is an important part of the culture of the Chinese martial arts. Morality is very important to the practice of martial arts in general and this idea of Wude is extolled by Kung Fu masters. It is the criteria on how students are judged by their masters, and whether or not they are deemed worthy to be taught.