noun
testimonial; presentation certificate
A formal document certifying a donation, award, or presentation; used in official or ceremonial contexts.
式典で、寄付者に贈与証書が手渡された。
At the ceremony, a presentation certificate was handed to the donor.
感謝状 is a letter of appreciation, often less formal and not necessarily tied to a donation; 贈与証書 specifically certifies a gift or donation.
Compound of 贈与 (donation) + 証書 (certificate). The exact historical derivation is uncertain, but the term is used in modern legal and ceremonial contexts.