The word 位子 is formed by combining the character 位, which carries the core meaning of "position" or "place" (often for a person), with the character 子, which here functions not with its literal meaning of "child" but as a common suffix added to nouns. This suffix 子 serves to nominalize and concretize the abstract concept of a "position", transforming it into a more tangible and commonly used term for a physical seat or an assigned spot one occupies.