https://docs.oracle.com/cd/E86824_01/html/E54767/mvwadd-wch-3xcurses.html
mvwadd_wch - man pages section 3: Curses Library Functions
add_wch , mvadd_wch , mvwadd_wch , wadd_wch - add a complex character (with rendition) to a window
man pageswchsectioncurseslibrary