Hinge Hinge A hinge is a mechanical bearing that connects two solid objects, typically allowing only a limited angle of rotation between them. Two objects connected by an ideal hinge rotate relative to each other about a fixed axis of rotation: all other translations or rotations being prevented, and thus a hinge has one degree of freedom. Hinges may be made of flexible material or of moving components. In biology, many joints function as hinges like the elbow joint. There are many types of door hinges. The main types include: Other types include: Since at least medieval times there have been
Pivot turn Pivot turn In dance, a pivot turn (or simply pivot) is a general classification for dance turns in which the performer's body rotates about its vertical axis without traveling. The performer may be supported by one or both feet, which swivel in place during the pivot turn. In some dance genres, a pivot on both feet is called a "twist turn". Pivot turns are commonly named as such in ballroom dancing, folk dancing and ethnic dances. In many other dance genres, pivot turns are known by specific names and typically are not referred to as pivots. For example, in ballet,