The etrog is a medium-sized citrus fruit, with a color, scent and taste similar to a lemon. It is also known in English as the citron, though there is apparently more than one variety of citron. This variety is identified in scientific literature as the etrog citron. The etrog is used in the waving rituals of the festival of Sukkot, where the etrog is said to represent the heart (because of its shape), and also said to represent the ideal kind of Jews, who have both knowledge of Torah and good deeds (because it has both a pleasant scent and a pleasant taste).