Credential (noun)

1. A qualification, achievement, personal quality, or aspect of a person's background, typically when used to indicate that they are suitable for something.
2. A document or certificate that serves as proof of a person's qualifications or identity.

Origin:

Early 17th century (in the sense "credentials"): from latin credentia "belief, trust", from credere "to believe".

Examples:

1. He presented his credentials to the authorities.
2. The job required specific credentials in computer science.
3. He was asked to provide credentials as proof of his identity.
4. The candidate's credentials were impressive.
5. The school required certain credentials to be admitted.