律

Phono-semantic compound:

彳 (척, step, walk) — semantic component, indicating movement, rule, order.

聿 (율, brush, to write) — phonetic component, providing the sound and associating with writing down laws and rules.

法律 (법률) — law, legislation

紀律 (기율) — discipline

律師 (률사) — lawyer, attorney

音律 (음률) — musical pitch, tone system

規律 (규율) — regulation, rule

In Korean, often alternates between 률 and 율 depending on phonological context (e.g., 법률 법률, 음률 음율).

In Classical Chinese, referred broadly to law and regulations, later extended to include musical pitch standards.