周期数

• 冂(surround; border)RADICAL
• 土(earth; soil; ground)ASSOCIATIVE
• 口(mouth; door)ASSOCIATIVE

A territory surrounded by boundaries like earth and gates enclosed all around.

• 其(that; that one)PHONETIC
• 月(moon; month)RADICAL

Watch the moon's phases wax and wane to count periods of time.

• 娄(many times; piled up)PHONO-SEMANTIC
• 攵(tap; hand motion)RADICAL

Counting numbers is using your hand to tap repeatedly many times in order to calculate.