防火墙
fáng huǒ qiáng · HSK 7
firewall
🧱🔥 防 defend + 火 fire + 墙 wall = a wall that defends against fire
The literal Chinese is defend-fire-wall, which maps perfectly to the English tech term firewall. Each character pulls its weight: 防 block/prevent, 火 fire, 墙 wall.
防 — mound radical 阝(阜) + 方 fāng (phonetic)
防 is a semantic-phonetic compound. The left element 阝 (from 阜) depicts a mound or earthen embankment, suggesting barriers and defense. The right element 方 supplies the sound. Together they evoke a dike or rampart that guards against floods or attacks, hence 'to guard, prevent, defend'.
火 — pictograph of flames rising
火 is a pictograph showing flames rising upward from a fire, with the central stroke as the main blaze and the side strokes as sparks. The ancient oracle bone form looked even more clearly like a burning flame. It still means 'fire' today and serves as a common radical in characters related to heat, burning, or cooking.
墙 — earth radical 土 + 啬 (qiáng/sè) phonetic
墙 is a semantic-phonetic compound. The earth radical 土 signals the meaning, since ancient walls were built from packed earth or mud bricks. The right side 啬 supplies the sound, originally depicting a granary, hinting at enclosing and storing. Together they form 'wall'.