Irssi has by default also defined several other keys which you can use:
return - The return/enter key
+ space, backspace - Space / backspace
up, down, left, right - Arrow keys
+ cleft, cright - Ctrl-left/right
home, end, prior, next - prior = Page Up, next = Page Down
insert, delete
delete_character
delete_next_word
delete_previous_word
+ delete_to_next_space
delete_to_previous_space
erase_line
erase_to_beg_of_line
(Word completion)
word_completion
+ erase_completion
check_replaces - Check word replaces
(Misc)
+ nothing - use this to disable a built-in key
refresh_screen
yank_from_cutbuffer - "Undelete" line
transpose_characters - Swap current and previous character
+ escape_char - Insert the next character exactly as-is to input line
insert_text - Insert data to entry line, data may contain $variables.
+ stop_irc - Send SIGSTOP to client (^Z)
Examples: