Not to be confused with Combo
See also: Game modifier
The mod multiplier is one of the multipliers which affects the score value of a single hit object throughout gameplay.
By default, the mod multiplier equals to 1.00x, however, if several mods are enabled, the final value is a product of respective mod multipliers. For example, if Hard Rock and Half Time are enabled simultaneously in osu!, the final value would be 0.318x.
Score Multiplier
, while in osu!(lazer) it is called Difficulty Multiplier
.