W przypadkach, gdy notariusz nie może pełnić swych obowiązków, sam notariusz, Prezes Rady właściwej Izby Notarialnej lub Rada Izby Notarialnej – w zależności od przyczyn niemożności pełnienia obowiązków przez notariusza - wyznacza na ten czas zastępstwo spośród zastępców notarialnych zatrudnionych w kancelarii notariusza albo spośród zastępców notarialnych z wykazu właściwej Izby Notarialnej. - http://www.gdin.pl/izba-notarialna-w-gdansku/zastepcy-notari...

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Information on substitute notaries:

"If a notary cannot perform his or her professional duties (e.g. because of being on vacation or ill) a substitute for a notary shall be appointed. While substituting for a notary, a substitute notary performs the duties of a notary and has the same rights and obligations as a notary.
In the substitution for a notary who is holding office, a substitute notary performs notarial acts in the name of the notary he or she substitutes for. In such cases the wording of certification notations includes: the name of the notary; the name of the substitute; a notation that the certifier is a substitute notary; signature of the substitute; the seal of the notary who is holding the office." - http://www.hcch.net/index_en.php?act=authorities.details&aid...

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§ 21. Substitute notary

(1) A substitute notary may be another notary, a former notary or a notary candidate who has sufficient practical experience.
(2) At the request of a notary, another citizen of a Member State of the European Union who complies with the requirements for notaries (except the requirement for completion of candidate service and passing of the notary examination) and who has passed the examination of a substitute notary may also be appointed as a substitute notary. The membership and rules of procedure of the examination board shall be approved by the Minister of Justice. - https://www.riigiteataja.ee/en/eli/511112013002/consolide

deputy notary (public)
acting notary (public)

https://www.google.pl/#q="acting notary"
https://www.google.pl/#q="deputy notary"

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Note added at 13 days (2015-03-05 04:32:34 GMT) Post-grading
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acting notary
http://www.proz.com/kudoz/german_to_english/law_general/2154...