I bought peanut butter and saw that next to the certification logo there is an "F". Does that mean "fleishig" or "fish" or something else? Please advise.

The "F" refers to "fish". As a rule, a fish designation means that you cannot eat that food with meat, but in this case it is not true. That hashgachah labels the peanut butter as "fish" because it contains a tiny bit of fish oil in it and they hold fish ingredients cannot be batel. [They do the same for orange juice, bread and some other items.] However, Rav Schwartz has said that fish can be batel b'shishim (and other hashgachos take a similar stance), and therefore we would say that it can be used with meat in spite of the fish ingredient.

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