Backspace key identifier - Solved

I'm have a .py script that sends keystrokes to LinuxCNC.

Basically you define the the keystroke in one array for example:
sendArray { "G1", "X",  "space"}  etc.

Then in a matching array you specify if that item should be sent as text or as a keystroke, so for the above example  "G1" and "X" would be specified as 2, 2 means just send as text, "space" would be specified as type 1 and "space" would be sent as if you pressed the space bar key.

I have this working for all desired keys except the backspace key.

I'm not sure what the correct text is for the backspace key, I have tried:
backspace
Backspace
Back Space
back space
None of these are correct

I struggled with the Enter key earlier until I tried "Return" and that works, so just the backspace key is unknown at this point.

Where can I find the correct definition that invokes the backspace key?

I'm using this with Axis if that matters.

Edit: solved the correct sequence is "BackSpace"