壹

yi̅ = y + Ø1

one (banker's anti-fraud numeral)

壹 character breakdown

壹
- 冖
- 土
  - 一
  - 十
    - 一
    - 丨
- 豆
  - 䒑
    - 一
    - 丷
  - 𠮛
    - 一
    - 口

mì = mi + Ø4

"cover" radical in Chinese characters (Kangxi radical 14), occurring in 軍|军[jun1], 冠[guan1] etc, known as 禿寶蓋|秃宝盖[tu1 bao3 gai4] or 平寶蓋|平宝盖[ping2 bao3 gai4]

Mnemonic symbol: 冖 shall be represented by a cooking top. Marilyn Monroe (mi-) wants to use the bathroom in the space station (Ø4), but the door is broken! She tries to cover herself with a cooking top (冖) instead.

土

tǔ = tu + Ø3

Tu (ethnic group) / surname Tu

土

tǔ = tu + Ø3

earth / dust / clay / local / indigenous / crude opium / unsophisticated / one of the eight categories of ancient musical instruments 八音[ba1 yin1]

土 = 十 + 一 : Tommy Turtle (tu) wants to fix a cross (十) on a flute (一) in the space station's living room (Ø3). He uses dust and clay (土) to hold them together.