Radical 乛

6 strokes

買

cap 乛 (247a) + head 头 (246) = buy 买

[买不到 (9, 74) mǎibudào out of stock]

(A schoolboy is going out to get illicit cigarettes) He puts a large cap on his head so that when he buys them he can smuggle them back in it. / Teddy puts on a bishop’s miter (trying to help, but only drawing attention to the two of them).

Compare this with “knee” (166a): this is a much longer stroke with a short hook at the end.