Wikipedia:Articles for deletion/Knuckle slider
looking at the sources above, none of them discusses a "knuckle slider" in detail. Every source either a player claims that they throw one, or they put the two pitches randomly together while mentioning a list of pitches. Clear cut example of  and 
— User:Secret, 04:58, 14 August 2012 (UTC)
Stance: delete
Cited policy: WP:NEO||WP:NOR (Wikipedia:Wikipedia is not a dictionary)