I haven’t researched notary fees in FL, but I don’t agree with LindaH-FL’s terminology.
Looking at the post from the end to the start, we all know what a signature is.
A stamp goes on a certificate. One certificate can name more than one person.
I see “notarial act” mentioned several times in the Florida law, but not a clear definition of what a notarial act is. I think the meaning is more clear in the Revised Uniform Law on Notarial Acts, which has been adopted with slight changes in my state, Vermont. It has a pretty good definition of notarial act:
(5) “Notarial act” means an act, whether performed with respect to a tangible or electronic record, that a notarial officer may perform under the law of this state. The term includes taking an acknowledgment, administering an oath or affirmation, taking a verification on oath or affirmation, witnessing or attesting a signature, certifying or attesting a copy, and noting a protest of a negotiable instrument.
Notice the singular through, such as “an acknowledgement” rather than “acknowledgements”. What each of these acts are is defined too. For example,
(1) “Acknowledgment” means a declaration by an individual before a notarial officer that the individual has signed a record for the purpose stated in the record and, if the record is signed in a representative capacity, that the individual signed the record with proper authority and signed it as the act of the individual or entity identified in the record.
(15) “Verification on oath or affirmation” means a declaration, made by an individual on oath or affirmation before a notarial officer, that a statement in a record is true.
So when Alice and Bob sign a document and request the notary take acknowledgements, the notary should first ask Alice if she signed for the purposes stated in the record, and if she is acting on her own behalf or is a representative. She says yes and that she is acting for herself. That’s the first acknowledgement. Then the notary asks Bob the same question of Bob, and he says yes, and he is acting for himself. That’s the second acknowledgement. That’s two notarial acts. It makes no difference whether there are to certificates and two stamps, one for Alice an one for Bob, or one certificate and one stamp, that names both Alice and Bob.
