罗马数字

• 罒(net; mesh (variant form))RADICAL
• 夕(evening; dusk)PHONETIC

Spreading a net at dusk to catch birds is the original meaning of the character.

• 馬(horse (pictographic))ASSOCIATIVE

The character 馬 depicts a horse with a mane, body, and four hooves running swiftly.

• 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.

• 宀(roof)RADICAL
• 子(child)ASSOCIATIVE

A child born under a roof and learning to speak gives rise to written characters.