What is the tool to remove this nut called?

What is the tool to remove this nut called?
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I have to replace a channel encoder on a Stryker and they use a different style nut on all the front knobs. I have seen this before elsewhere and usually manage to remove them with a little effort and a lot of aggrivation. I’m not wanting to use that brute force tactic here.
What is the tool to remove this nut called?IMG_20260713_124413407_HDR.jpg

Anyone know the name of the tool or where to get one? Thanks..

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Author: iz4wnp