Pivot joint in rotating an arm inward). When rotating the forearm, these movements are typically called pronation and supination. In the standard anatomical position, the forearms are supinated, which means that the palms are facing forward, and the thumbs are pointing away from the body. In contrast, a forearm in pronation would have the palm facing backward and the thumb would be closer to the body, pointing medially. Examples of a pivot joint include: In contrast, spherical joints (or ball and socket joints) such as the hip joint permit rotation and all other directional movement, while pivot joints only permit rotation. Pivot
Stamp hinge “peelable”, meaning that the stamp may be removed from the page, and the hinge from the stamp, without any damage to either. Not all makes of hinge have this property, and the backs of many stamps have “hinge remnants”, where the hinge has torn away rather than releasing the stamp. This is especially common for mint stamps, where the stamp’s own gum adheres tightly to the hinge. Some old stamps may actually have multiple hinge remnants layered on top of each other. Conversely, careless removal of a hinge may take away a layer of the stamp’s paper, resulting in a