有效
yǒuxiào · HSK 3
valid
✅ 有 (have) + 效 (effect) = has effect → effective, valid
有 means 'to have' and 效 means 'effect' or 'result'. Together they literally mean 'has effect' — something that works, is valid, or produces the intended outcome.
有 — hand 𠂇 + moon/meat 月
Originally depicted a hand holding a piece of meat (月 here is the 'meat' radical, not moon), expressing the idea of possessing something. Over time the meaning broadened from 'to hold/possess' to the general sense of 'to have' or 'there is/exists'.