Where the shape comes from
A single feather or tuft: the shaft curves up and the barbs branch off it. It names body hair and animal coats — 羊毛 is wool, 毛巾 a towel, literally the napped cloth — and in everyday money talk 一毛 is a tenth of a yuan, the spoken form of written 角.
汉字 filed under 毛
No published character on HSK Guide is filed under this radical yet. 汉字库.