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).
Willy Walrus (w) built a winding machine (宛) to wind up sleeping bags (夗) in the anthill (an3). For his invention he got a honorary PhD degree and a graduation cap (宀), but as the winding machine winds up the sleeping bags his graduation cap gets in and ruins it.