The Japanese suffix '校 (こう)' means 'school' and is commonly attached to the names or types of educational institutions. It is used to specify the type of school or to refer to a particular school. For example: elementary school「小学校」(しょうがっこう), high school「高校」(こうこう), or Tokyo University「東京大学校」(とうきょうだいがくこう). This suffix is neutral in tone and is widely used in formal and informal contexts. Note that '校' can also appear in compound words related to schools, such as '校舎 (こうしゃ)' (school building) or '校長 (こうちょう)' (school principal).