The word 订阅 is formed by combining the characters 订 and 阅, where 订 consists of the radical 言 (speech) and the phonetic component 丁 (dīng), conveying the idea of agreeing or ordering, and 阅 consists of the radical 門 (door) and the component 兌 (duì), conveying the idea of reading or inspecting; together, they logically construct the meaning of subscribing, as in ordering for reading.