bind <key> altcharset
This inserts the altcharset character into the input line. The altcharset character looks like a reverse capital E. The altcharset character toggles the use of the alternate character set in your terminal emulator's font, if it has one. This function is not useful for those who use Unicode/UTF8 terminal emulators (ie, most people)
This keybinding first appeared around EPIC4pre1.043.