This is the 185th most frequent Italian word.
pochi
"Pochi" means "few" in English.
Here, 'pochi' functions as an indefinite adjective modifying 'alberi' (trees), indicating a small quantity of trees present.
Ci sono pochi alberi in questo parco.
There are few trees in this park.
In this case, 'pochi' is used as an indefinite pronoun referring to a small number of people who know the game's rules.
In pochi sanno le regole di questo gioco.
Few know the rules of this game.
Here, 'pochi' acts as an indefinite pronoun describing a limited number of individuals who attended the party.