lì

Strength, force, power. A picture of a muscle in its sheath. It is the radical of the character, No. 19.

Compounds
力气 lìqi – strength; effort
吃力 chīlì – (colloquial) tiring; exhausting
用力 yònglì – to exert oneself; to apply one’s force
能力 nénglì – ability
巧克力 qiǎokèlì – chocolate

Learn more about 力 at Wikionary