This article is from the Table Tennis (Ping Pong) FAQ, by ttennis@bu.edu with numerous contributions by others.
9.1 The ball shall be in play from the last moment at which it is
stationary before being projected in service until:
9.1.1 It touches something other than the playing surface, the net
assembly, the racket held in the hand or the racket hand below the
wrist.
9.1.2 The rally is otherwise decided as a let or a point.
 
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