日字旁, rì zì páng, 表示与太阳或光线有关的字。日部，为汉字索引中的部首之一，康熙字典214个部首中的第七十二个（四划的则为第十二个）。
Next to the word “日”, rì zì páng, indicates a word related to the sun or light. The Japanese part is one of the radicals in the Chinese character index, and the 72nd of the 214 radicals in the Kangxi Dictionary (the four-stroke is the 12th).
汉字是世界上使用时间最久、空间最广、人数最多的文字之一，汉字的创制和应用不仅推进了中华文化的发展，还对世界文化的发展产生了深远的影响。大约在距今六千年的半坡遗址等地方，已经出现刻划符号，共达五十多种。
Chinese characters are one of the characters with the longest use time, the widest space, and the largest number of people in the world. The creation and application of Chinese characters not only promoted the development of Chinese culture, but also had a profound impact on the development of world culture. More than fifty kinds of carved symbols have appeared in places such as the Banpo ruins about six thousand years ago.
学字头主要与通过感官去学习有关。学字头常见字：学，觉。其实并没有学字头，学字头为繁体，是繁体字变成简化字以后才使用。
Learning the prefix is mainly related to learning through the senses. Common words at the beginning of learning: learn, feel. In fact, there is no learning head. The learning head is traditional, which is used only after the traditional characters have become simplified characters.