极细小

• 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.

• 糹(thread; fiber)RADICAL
• 田(field; paddy field)PHONETIC

A thin thread like a furrow in a field is small and delicate.

• 小(small; tiny)ASSOCIATIVE

Three tiny strokes represent fine grains of sand, conveying the meaning of "small" or "tiny."