便
びん · bin · JLPT N3 · noun
manner
✈️📮 亻 person + 更 change = a handy way; びん sounds like bin, as in mail bin
Read as びん, 便 counts flights and deliveries: 航空便 is airmail, 郵便 is the postal service, and 次の便 is the next flight. Read as べん, it means convenience, as in 便利 (handy).
便 — person 亻 + change 更
A semantic compound: 亻(person) beside 更 (to change/replace). The original sense was a person making things easier or more convenient by adjusting them. From 'convenient' it extended to 'then/thereupon' (biàn) and to bodily 'discharge' (as in 大便).