Lulav (Hebrew: לולב) is a closed frond of the date palm tree. It is one of the Four Species used during the Jewish holiday of Sukkot. The other Species are the hadass (myrtle), aravah (willow), and etrog (citron). When bound together, the lulav, hadass, and aravah are commonly referred to as "the lulav".
Read more about Lulav: Codification in The Torah, Regulations of The lulav