name for this joint

https://i.imgur.com/PbnCuHd.jpg
like this piece and i like the simple detachable base
but i wonder if there is a name for that style of joint as i am now curious to look at more of this style
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Look for rule joints
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On Sun, 14 Jan 2018 07:52:06 -0500

maybe a hingless rule joint
all the ones i saw used a hinge
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