/ɔːtəgrɑːf ˈsɪɡnɪtʃər/ – Phrase
Definition: chữ ký chính tay, chữ ký thực.
A more thorough explanation: An autograph signature refers to a person’s handwritten signature, typically made by that person on a document or item as a form of authentication or endorsement.
Example: The autograph signature on the contract was verified by a handwriting expert.