What are components in a scissor?

basically 2 knife blades with handles that are pinned or hinge together side by side. Closed they appear as one. When opened they appear as an X with the handles on one side and the blades opposite. As the x form is closed the 2 blades pass each other until they are closed. In this passing transition is the area of the blades that cutting happens. One blade is usually a square edge vs. a sharpened wedge edge which assists the cutting action to avoid pinching.