Splinter - Random Singleton/Void
Random Splinters can, by partnership agreement, be used in one of two ways, to differentiate between holding a singleton and a void, or between a normal HCP hand or a strong HCP hand.
Another advantage of using Random Splinters is that if partner signs off in game, the opponents will not know which suit responder's singleton (or void) is in.
Singleton vs. Void
1-3 or 1-3N shows 4+ card support, 10-12 HCPs, and a singleton in an unspecified suit. Opener can bid 4 of his suit if not interested in slam, or he can bid 4 of the next higher rank (Clubs, Diamonds or Hearts, in this case) to ask responder for the singleton's suit.
If bidding a void suit would take responder past game level, bidding opener's suit shows a singleton in the higher suit.
A jump higher than 3 shows a void.
Normal vs. Strong Hands