巨大
jùdà · HSK 4
huge
🐘 巨大 = 巨 (huge) + 大 (big) — two 'big' characters stacked for emphasis
巨 originally depicted a carpenter's giant L-square ruler, later generalised to mean huge. Pair it with 大 (big) and you get a doubled-up word meaning gigantic or gargantuan.
大 — pictograph of a person with arms outstretched
大 is a pictograph showing a person standing with arms and legs spread wide. The outstretched arms suggest 'big' or 'great', extending from the literal image of a large stance to abstract meanings like important or grand. It is one of the oldest characters, found on oracle bones.