感かん謝しゃ状じょう

noun

thank-you letter; letter of appreciation; certificate of appreciation

A formal written expression of gratitude, often presented as a certificate or official letter.

• ボランティア活かつ動どうに対たいして、市し長ちょうから感かん謝しゃ状じょうが贈おくられた。

  A letter of appreciation was presented by the mayor for the volunteer work.