The word 输入 is formed by combining two individual characters, each contributing a core action to create a composite meaning. The first character, 输 (shū), carries the inherent idea of "to transport", "to convey", or "to lose" (as in moving something away). The second character, 入 (rù), means "to enter" or "to go into". When placed together, they sequentially depict the action of conveying something into a place or system, visually and conceptually representing the flow of something (like data, power, or a resource) from an external source into an internal recipient, hence meaning "to input".