The word "邮票" (yóupiào), meaning "postage stamp", is formed by combining two characters: "邮" meaning "post" or "mail", and "票" meaning "ticket" or "stamp". The character "邮" is a phono-semantic compound where the radical "阝" (from "邑", indicating a place or city) provides the semantic field related to mail, and "由" (yóu) suggests the pronunciation. The character "票" originally denoted a slip or label and here specifies the object as a stamp. Together, they create a compound word where "邮" modifies "票" to specify a stamp used for postal services.