The currency of Poland is the Polish złoty, written as:
Name: Polish Złoty
Code: PLN
Symbol: zł
You’ll often see it quoted in forex as a pair like:
USD/PLN (U.S. Dollar vs. Polish Złoty)
EUR/PLN (Euro vs. Polish Złoty)
you can trade PLN in forex, but it is considered an exotic currency pair, not a major.
✔ Available to trade (with most brokers):
USD/PLN
EUR/PLN
GBP/PLN (on some brokers)