What's an authoritative definition of whether the idealized pinned support and pin joint can transfer moments in 3D?
Most sources say both of them cannot transfer moments but are apparently only considering 2D. A real pin joint obviously can transfer moments about all axes normal to the pin's axis. So is an implementation of the ideal pin joint really more like a ball joint than a pin joint?
I assume a pinned support is the same as a pin joint but with one end fixed to ground. But maybe they have different numbers of degrees of rotational freedom?
For example, if this support can carry moments about two perpendicular axes (red arrows), would it be correctly called a pinned support?
In comparison, this one has all 3 rotational degrees of freedom, so is it still a pinned support?