对称
duì chèn · HSK 7
symmetry
🦋 duì chèn = facing + weighing — both sides balance equally
对 means facing or opposite, 称 means to weigh or measure. When both sides of a scale face each other and weigh the same, you get symmetry. A butterfly's wings are the classic example — each side a mirror of the other.
对 — 又 (hand) + 寸 (measure/rule)
Originally depicted a hand (又) holding or responding to something, with 寸 added as a phonetic-semantic element suggesting measured action. The traditional form 對 showed a hand presenting an object in reply, giving the core sense of 'to answer' or 'face toward.' Modern meanings like 'correct' and 'pair' grew from this idea of matching response.
称 — grain 禾 + 尔 (phonetic)
称 is a semantic-phonetic compound: the grain radical 禾 on the left points to weighing grain on a balance, while 尔 hints at the sound. It originally meant 'to weigh' on a steelyard, then extended to 'to state the weight of,' and finally to general senses like 'to call,' 'to name,' or 'title.'