What does mean?

I was troubleshooting a problem with the behavior of my mouse in
gvim when I discovered that typing Ctrl-K in insert mode and moving
the mouse to another window enters the special key code
"<LeftMouseNM>". I can't find this special key documented anywhere.
Even ":helpgrep \cmousenm" didn't return any results.

Would someone please tell me what "<LeftMouseNM>" means?

I'm using gvim 9.0.929 on Ubuntu 22.04.

(The problem I'm troubleshooting is not a bug in Vim, it's a problem
with me dragging my thumb pads across my trackpad while I'm typing
which then moves the cursor. I thought I had fixed the problem but
then I encountered this mouse event.)

Regards,
Gary

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