How to key bind 'backward-kill-line' to Ctrl+Shift+Backspace?

I have used answer of [zsh kill Ctrl + Backspace, Ctrl + Delete](https://unix.stackexchange.com/a/12789/188538) to configure following key binding: - Ctrl+Backspace: delete until the beginning of current word, - Ctrl+Delete: delete until the end of current word, - Ctrl+Shift+Delete: delete until the end of the line. This have been done using these commands:

$ bindkey -M emacs '^[[3;5~' kill-word
$ bindkey -M emacs '^H' backward-kill-word 
$ bindkey -M emacs '^[[3;6~' kill-line

To know how to encode the keys (i.e., the ^[[3;5~ part), I used the "trick" detailed in the answer: _"type Ctrl+C Ctrl+Delete to see what the value is on your system"_. **Problem** == I would like to bind Ctrl+Shift+Backspace to the backward-kill-line command (i.e. delete everything between the cursor and the beginning of the line). However, when I type Ctrl+C Ctrl+Shift+Backspace, my prompt only shows ^H — i.e. the same key combination as Ctrl+Backspace.