Stroke order is not decoration — it determines how the character looks handwritten and how dictionaries index it.
The radical is the part a paper dictionary files a kanji under, and it usually hints at meaning. 巛 is filed under 巛 (river) — radical number 47 of the 214 in the Kangxi system.
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巛 means Curving River Radical (no.47).
巛 is read on'yomi (Chinese-derived) せん; kun'yomi (native Japanese) かわ.
巛 is written with 3 strokes. The animated diagram on this page shows the correct order.
The radical of 巛 is 巛 (river), radical number 47 of the 214 Kangxi radicals. The radical is the component a dictionary files the character under, and it usually points at the character's meaning.
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