Oh-Nine Factor Share definition Flag Equal to 0.000000001%. An extremely low probability of something occurring. Was seen in Neon Genesis Evangelion. The chance of this working is 0.000000001%, or pathetically enough an Oh-Nine Factor. Oh-Nine Factor by DarthShinji January 25, 2014 0 0 Get merch Get the Oh-Nine Factor mug. Buy Now — $32.95 See more merch