These fighting styles are often classified according to common features , identified as `` families '' ( å , jiÄ ) , `` sects '' ( æ 3\/4 , pÃ i ) or `` schools '' ( é -- , mÃ n ) of martial arts . These fighting styles are often classified according to common traits , identified as `` families '' ( å , jiÄ ) , `` sects '' ( æ 3\/4 , pÃ i ) or `` schools '' ( é -- , mÃ n ) of martial arts .