Refers to the boys who wear dk uniforms every day. Dk uniforms are the uniforms of male high school students, romaji danshikoukousei. Take dk for example. Dk uniforms usually include sweaters, shirts, ties, lapels, western-style uniforms and other clothing types. Collar is the most common school uniform for Japanese boys. 70% of junior high schools adopt black "collar" school uniforms, and so do about 20% of colleges and universities. Western-style school uniforms were first tried out in government universities, and the earliest introduction of western-style school uniforms was the University of Industry and Information Technology (the predecessor of the Department of Engineering of the University of Tokyo). Jk stands for the uniform of female high school students, and dk stands for the uniform of male high school students. Girls' high school uniforms include vest skirt, summer clothes, medium clothes, vests, suits, coats, winter clothes, cardigans, sweaters and shirts, while boys' high school uniforms are basically divided into lapels and western styles. The uniforms of female high school students have special youthful significance, which is the embodiment of youth and beauty, while the uniforms of male high school students have no special significance.