<Dl> <Dd> A pitch thrown with no spin, traditionally thrown with the knuckles, but also with the fingertips . It tends to flutter and move suddenly and erratically on its way to the plate . Also refers to a batted ball that flutters "like a knuckleball". SYNONYMS: knuckler, flutterball, butterfly ball, floater, bug . </Dd> </Dl> <Dd> A pitch thrown with no spin, traditionally thrown with the knuckles, but also with the fingertips . It tends to flutter and move suddenly and erratically on its way to the plate . Also refers to a batted ball that flutters "like a knuckleball". SYNONYMS: knuckler, flutterball, butterfly ball, floater, bug . </Dd>

What does the k in baseball stand for