刂

da̅o = d + ao1

Kangxi radical 18 (刀[dao1]) as a vertical side element / see also 立刀旁[li4 dao1 pang2] / see also 側刀旁|侧刀旁[ce4 dao1 pang2]

刂 = 丨 + 亅 : Mnemonic symbol: a kitchen knife. Don Quixote (d) is showing off his special knifes in front of the aorta (ao1). One is made from a dinosaur bone (丨), and the other is made from a crowbar (亅).

刂 character breakdown

刂
- 丨
- 亅

丨

gǔn = gu + (e)n3

radical in Chinese characters (Kangxi radical 2)

Mnemonic symbol: a dinosaur bone. Gitta Giraffe (gu-) found a gorgeous dinosaur bone (丨) in the encampment's living room ((e)n3).

丨

shù = shu + Ø4

vertical stroke (in Chinese characters), referred to as 豎筆|竖笔[shu4 bi3]

Mnemonic symbol: a dinosaur bone. Sheldon Shrimp (shu) found a gorgeous dinosaur bone (丨) in the space station's bathroom (Ø4) and is cracking it open to eat its bone marrow.

亅

jué = ju + e2

"vertical stroke with hook" radical in Chinese characters (Kangxi radical 6) / see also 豎鉤|竖钩[shu4 gou1]

Mnemonic symbol: 亅 looks like a crowbar. Zeus (ju) is bored and presses all the buttons next to the elevator kitchen's (e2) door with his crowbar (亅).