旋转角速度

• 車(vehicle; cart; car)RADICAL
• 專(specialize in; concentrate on)PHONO-SEMANTIC

A wheel keeps spinning in one direction, so it's called rotating or turning.

• ⺈(blade (upper part); blade edge (top))ASSOCIATIVE
• 用(use; employ)ASSOCIATIVE

A sharp horn like a knife blade is used for stabbing, resembling the pointed horn of an animal.

• 广(roof; broad eaves)RADICAL
• 廿(twenty; many times measure)ASSOCIATIVE
• 又(right hand; again; once more)ASSOCIATIVE

Under a roof, use your hand to measure back and forth many times to get accuracy.