This is the 9988th most frequent Polish word.
autografów
Autografów: "Autographs" or "signatures" (genitive plural form in Polish).
The word "autografów" here is used in its plural genitive form, referring to the type or ownership of the displayed autographs.
Na wystawie kolekcjonerów widniało wiele rzadkich autografów.
At the collectors' exhibition, many rare autographs were displayed.
Here, "autografów" is also in its plural genitive form, complementing a numeral phrase (indicating a quantity).
Podczas spotkania z autorem poprosiliśmy o kilka autografów.
During the meeting with the author, we asked for a few autographs.
In this sentence, "autografów" again serves as the plural genitive form, specifying what type of collection is being referred to.