A Symbol-Specific Multiplier is a special system where the multiplier applied to winnings is not applied universally to all winning combinations, but is instead applied only to a single 'target symbol' type that is randomly designated for each spin.
The core of this feature is to create a new 'protagonist symbol' on every spin to maximize unpredictability, and to create an unimaginable 'big hit' if the designated target symbol happens to land a win with a high multiplier.