Table tennis uses a handheld paddle across a net, while volleyball is played with the hand or body alone, so it sits under Court and Net Team Sports.
Racket Sports covers sports in which a ball or shuttlecock is struck with a handheld racket or paddle across a net, including badminton, squash, table tennis and tennis. Volleyball is excluded because it is played with the hand or body alone rather than a handheld striking implement, so it is grouped instead under Court and Net Team Sports.