This is the 8806th most frequent Russian word.
польское
"Polish" (relating to Poland).
In this context, 'польское' functions as an adjective describing a type of art, specifically related to Poland.
Я изучал польское искусство в университете.
I studied Polish art at the university.
Here, 'польское' acts as an attributive adjective describing a literary work's origin, linking it to Poland.
Эта книга — известное польское произведение.
This book is a famous Polish work.
In this sentence, 'польское' describes the television as associated with Poland, signifying its national identity.