This is an acorn. Acorn is the fruit of an oak tree. It is very long and looks like a cocoon. There is a half lid on the skull, which looks like a protrusion on Sakyamuni's forehead. There is a hard shell outside, reddish brown, and the nuts are like peanuts and rich in starch. Hazelnut is round; It is the fruit of hazel tree, which looks like chestnuts. The shell is hard, and the nuts are fat and round, fragrant and oily. It tastes particularly delicious and has an endless aftertaste. Therefore, it has become one of the most popular nut foods and is called "the king of nuts".