What is this armature bone?

armature

I found this rig back in 2012 but only till my time really practicing Blender and modeling did I check out some of the rigs from users over the years, I notice this shoulder bone that is fixed to move around these axis

Is this some mod or driver cause I check as best I could and couldn’t find any drivers or mods that I read doing this function in blender to replicate it if needed.

Some help would be very appreciated

It is IK angle limits on the bone. Select it, look at properties/bone/inverse kinematics.

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I found the properties in question. You’d think you know your way around something then you find out there’s still much to learn. I’m still not use to the 2.8 UI after months and only started to explore the work of others to improve my own.

Thank you for answering.