郵 means “mail, post”

ゆう · yuu

Also: stagecoach stop

On'yomi (Chinese reading)
ユウ

JLPT N2 · Taught in grade 6 · 11 strokes

The story

Picture a town (阝) far out on the frontier (垂): a relay station where couriers swapped horses. 郵 is mail: 郵便局 is the post office, and the seven-digit 郵便番号 goes on every envelope after the 〒 mark.

Used in 郵便 (yuubin, mail/postal service), 郵便局 (yuubinkyoku, post office), and 郵送 (yuusou, sending by mail)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.