Wu Dip Jeung
Wu Dip Jeung or Butterfly palms have several differant meanings to differant lineages of Wing Chun. In Yuen Kay Shan Wing Chun, the Term "Wu Dip Jeung" refers to the Po Pai Jeung or Breaking Row Palms- IE Verticle Double Palm strikes with the fingers facing opposite directions - 1 pair up and 1 pair down. In Kulo Village Wing Chun Wu Dip Jeung refers to a San Sik Set, that trains Kwan sau and Double Horizontal Palm Strikes that resemble a Butterfly.
In Kulo Village there is a 2 man Cycle drill to train the proper feeling for use of this method. Legend states this was a speciality of Leung Jan's