In theoretical physics, Q-ball refers to a type of non-topological soliton. A soliton is a localized field configuration that is stable—it cannot spread out and dissipate. In the case of a non-topological soliton, the stability is guaranteed by a conserved charge: the soliton has lower energy per unit charge than any other configuration. (In physics, charge is often represented by the letter "Q", and the soliton is spherically symmetric, hence the name.)

Read more about Q-ball:  Intuitive Explanation, Constructing A Q-ball, History, Occurrence in Nature, Fiction

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Q-ball - Fiction
... CERN scientist Brian Cox, proposed "infection" with a Q-ball as the mechanism for this death, but this is mentioned only in the commentary tracks and not in the movie itself ... In the fictional universe of Orion's Arm, Q-balls are one of the speculated sources for the large amounts of antimatter used by certain groups ... character Rembrandt Brown refers to his fellow main character Quinn Mallory as Q-ball ...
Federal Moguls - Personal Backgrounds - Q-Ball
... DJ Q-Ball was born Harry Dean, Jr on October 8, 1974 in Limerick, Pennsylvania ... Q-Ball graduated from Owen J ... Q-Ball is also one of the three members of the band to have college degrees ...