旺
wàng · HSK 7
prosperous
🔥 旺 = 日 sun + 王 king (wáng gives the sound); a king's sun shines prosperous
The 王 part also carries the wàng/wáng sound, so it doubles as the phonetic clue. Sense runs from bright sunlight to a roaring fire and flourishing trade — all senses of things at full, thriving strength.
旺 — sun 日 + flourish 王
Originally written 暀, meaning bright sunlight spreading outward. Over time the form simplified to 旺, combining 日 (sun) with 王 (king/flourish), which also hints at the pronunciation. The meaning shifted from 'bright' to 'flourishing, prosperous, vigorous.'