/sɪˈkjʊrəti sil/ – Phrase
Definition: con dấu bảo mật hoặc niêm phong.
A more thorough explanation: a thin piece of paper, metal, plastic, or other material that covers the opening of a box of goods and which must be broken in order to open the box
Example: When it is opened, the security seal is destroyed so retailers and consumers can see at a glance if the bottle has been tampered with.