What does OOF mean?

I was looking for a flavor percentage and found it on this site but it doesn’t have the standard markings like TPA,CAP,LA etc it has OOF before it and was wondering what that meant? Any help is greatly appreciated

I think OOF is the same as OOO and 1o1 - One-on-One Flavors - Of course I could be wrong? :smiley:

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