From Wikipedia...
The shaka sign, commonly known as "hang loose", is a gesture often associated with Hawaii and surfer culture. It consists of extending the thumb and smallest finger while holding the three middle fingers curled, and raising the hand in salutation while presenting the back; the hand may be rotated back and forth for emphasis.
The shaka sign was popularized among locals in Hawaii through its use by surfers and in surf culture throughout the state in the 1960s; it remains a salutation of friendship used by the local culture at large.
In other words... this is a worldly hand gesture which is not sanctioned by the Watchtower Corporation.