This is the 15172nd most frequent Polish word.
sanocki
"Sanocki" refers to something related to the town or region of Sanok in Poland.
In this sentence, 'sanocki' is an adjective that refers to something of or related to Sanok, a city in Poland, describing the market belonging to or located in Sanok.
Sanocki rynek jest popularnym miejscem spotkań.
The Sanok market is a popular meeting place.
Here, 'sanockie' as an adjective modifies 'muzeum', indicating that the museum is situated in Sanok or associated with the city.
Sanockie muzeum jest znane ze swojej kolekcji ikon.
The Sanok museum is known for its icon collection.
In this sentence, 'sanockiego' is the genitive form of the adjective describing the county pertaining to Sanok.