同封
どうふう · doufuu · JLPT N1 · noun
gram
✉️📎 同 (together) + 封 (seal/envelope) = sealed together in the same envelope
同封 is used when an item is enclosed with a letter. 封筒 means envelope, so 同封 means the item is sealed into the same envelope as the letter.
同 — 冂 enclosure + 一 + 口 mouth
Originally depicted multiple mouths gathered under one cover or enclosure, suggesting people speaking together in agreement. From this image of voices joining, it came to mean 'same,' 'together,' or 'alike.' The shared cover symbolizes unity.
封 — earth 土 doubled (圭) + inch 寸 (hand)
Originally a pictograph of a hand planting a sapling on a mound of earth, marking a boundary. From this came the meaning of granting fiefs to nobles, then sealing or closing off territory. The modern senses 'to seal' and 'envelope' both stem from this idea of enclosing.