title case
noun [ U ] uk/ˈtaɪ.təl ˌkeɪs/ us/ˈtaɪ.t̬əl ˌkeɪs/
（用于书名、电影名等的）词首字母大写
the use of capital letters in the most important words of titles of books, films, etc.
The application allows you to toggle between sentence case and title case. 该应用程序允许你在句首字母大写和词首字母大写之间切换。