极端分子

• 木(tree; wood)RADICAL
• 及(reach; attain; catch up)PHONO-SEMANTIC

An extreme point is the uttermost end of a wooden pole, where a hand just barely reaches.

• 立(stand upright; erect)RADICAL
• 耑(sprout; bud)PHONETIC

Standing upright and straight from beginning to end is the meaning of the character 端.

• 八(divide; separate; eight)ASSOCIATIVE
• 刀(knife; blade; sword)RADICAL

Using a knife to chop something in half represents division or separation.

• 子(child (pictographic))ASSOCIATIVE

The character 子 depicts a newborn child with a large head and arms outstretched.