Igneous Rock

I'm trying to debug a patch, and I'm using the debugger for the first time (it is a revelation).

However, it's not clear to me what the WP means (see screenshot) and this is not explained on the debugger help page nor does Google find anything. Your expertise would be greatly appreciated.

I'm trying to debug a patch, and I'm using the debugger for the first time (it is a revelation). 

what-does-wp-mean-in-the-debugger-window

WP Stands for the "Watch Point" number that interrupted the execution.

What does "WP" mean in the debugger window?