丕

pi̅ = pi + Ø1

grand

丕 character breakdown

丕
- 一
- 不
  - 丆
    - 一
    - 丿
  - 卜
    - 丨
    - 丶

yi̅ = y + Ø1

one / single / a (article) / as soon as / entire; whole; all; throughout / "one" radical in Chinese characters (Kangxi radical 1) / also pr. [yao1] for greater clarity when spelling out numbers digit by digit

Maud Younger (y) forgot her keys to the space station (Ø1), all she brought outside was her flute (一). She has no choice but to crash the door with the giant flute.

不

bù = bu + Ø4

no; not so / (bound form) not; un-

不 = 丆 + 卜 : Bruno Bear (bu) is setting up a wind wheel (丆) with a voodoo staff (卜) in the space station's bathroom (Ø4). He also puts a "forbidden" sign (mnemonic symbol for 不) on it, to make clear that it may not (不) be stopped.