唿 唿 hu1
to whistle (with fingers in one's mouth); (onom.) for the sound of the wind

strokes 11
radical
口
口
strokes after radical 8
唿喇 唿喇 hu1 la3
whoosh

唿喇喇 唿喇喇 hu1 la4 la4
roar of the wind

唿哨 唿哨 hu1 shao4
to whistle (with fingers in one's mouth); nowadays written 呼哨