There are many species of grain that are called millet, these include:
Panicum miliaceum (L.), Broom Corn, Pannag (this is the millet in the Bible) Setaria italica (L.) P. Beauvois, Foxtail Millet Pennisetum glaucum (L.) R. Br., Pearl Millet Sorghum bicolor(L.) Moench, Grain Sorghum and Sweet Sorghum Paspalum scrobiculatum (L.) , Kodo Millet Eleusine coracana (L.), Finger Millet