Double joints
Of the sort you'd see on action figures and such. They provide a better range of articulation on, for example, a knee than a single joint would.
I guess this could be that in LEGO form. Obviously it's possible to do something equivalent with two ball pieces or the super-short double socket piece, but thanks to the meshing gears this would only have one degree of freedom so the motion is smooth, rather than having to position the two pivots separately. The tradeoff is it probably isn't as easy to work into a limb and it has no friction. Oh well.
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