Wordnet polsko-angielski 
                        
1. (something that baffles understanding and cannot be explained
"how it got out is a mystery"
"it remains one of nature's secrets") 
mystery, enigma, secret, closed book 
synonim: tajemnica
synonim: enigma
synonim: misterium
synonim: niewiadoma
synonim: znak zapytania
synonim: zagadka
2. (a punctuation mark (?) placed at the end of a sentence to indicate a question) 
question mark, interrogation point: : synonim: znak zapytania
Słownik polsko-angielski EXETER Copyright © http://www.kastor.strefa.pl.
                        question mark, query
Słownik polsko-angielski PARK Copyright: © wersja książkowa słownika dostępna w wydawnictwie PARK
                        n masc C question mark
Otwarty słownik polsko-angielski V.9.2007, Copyright (c) Jerzy Kazojć - 2007 r.
                        prompt
Nowoczesny słownik polsko-angielski 
                        question-mark