A document or letter that guarantees something will be done, such as a written pledge of conduct or a letter of guarantee.

diploma issued upon completion of a degree; degree certificate

diploma; graduation certificate awarded by a school to certify that a student has completed their course of study

An official document proving the legal marriage relationship between two people, usually signed by the couple during the wedding ceremony; marriage license

A certificate of attendance or partial completion issued to a student who has completed some coursework but did not graduate

credentials; professional or qualifying certificate

A document representing a formal obligation to pay back a debt; a financial security that represents money borrowed