This is the 15153rd most frequent Polish word.
salonu
"Salonu" means "of the living room" or "of the salon" in English, depending on context.
Here, 'salonu' is used to refer to the living room in a house (genitive case, indicating direction towards).
Idę do salonu, żeby odpocząć.
I'm going to the living room to relax.
In this sentence, 'salonu' is in the genitive case, indicating possession ('of the living room').
Kolor ścian salonu jest bardzo elegancki.
The color of the living room's walls is very elegant.
This is actually incorrect usage— the correct form for location in a place would be 'w salonie' (locative case), but this demonstrates a common learner mistake focusing on the word form.