No nut, nut, no nut, nut, no nut, nut, no nut, nut, no nut, nut, no nut, nut, no nut, nut, no nut, nut, no nut, nut, no nut, nut, no nut, nut, no nut, nut, no nut, nut, no nut, Nut, Nut, NUT.
Tee Nuts are annoying coz there are also T Nuts, which are used in aluminium extrusion channels. And there's also Tea Nuts which are nuts you put in tea if you are low on iron.
Any regular hex nut works just fine as a jam nut. Basically, a jam nut is when you jam two nuts together. (It is gay, because the nuts do touch.)
And note that those nylon inserts kinda only work once. The bolt carves a thread into the insert when you insert it, so it will be weaker the second time you insert it.
Honorable mention: cage nuts. A square nut, permanently attached to a fastener that can snap into a special square hole in a 19 inch server rack. When you tighten the bolt against the nut, it tightens against the fastener, so that the nut, bolt, and fastener are secure against the square hole.
If we could all stop using wrenches on the wing nut wings and snapping them off that would be great. Either get the wing nuts with the wrench base or hand tighten only!