Translation of "Jena" in English

Kurs jena wzrósł w stosunku do dolara.

The exchange rate for the yen against the dollar has risen.

Brokerzy zarobili masę pieniędzy na wysokim kursie jena.

Brokers made a killing because of the high yen.

Nie mogę sobie pozwolić na zmarnowanie nawet jednego jena.

I can't afford to waste a single yen.