/əˈfɪʃəl sil/ – Phrase
Definition: con dấu chính thức.
A more thorough explanation: An official seal refers to a device or emblem used by an organization, government agency, or public authority to authenticate documents, contracts, or other official records. It typically bears the organization’s name, logo, or other identifying marks and is used to signify the official nature and authenticity of the document to which it is affixed.
Example: The official seal of the company must be affixed to all important documents for them to be considered valid.