亨
=
亠
+
口
+
了
:
Mnemonic symbol: American scientist Joseph Henry.
Before Henry (亨) invented inductance he used to hang out with Hamlet (h) a lot in front of the engine ((e)ng1). One day he observed Hamlet shifting a mandarin (口) from a price cup (了) to a beret (亠) and vice versa, which gave him the idea of putting an iron core into an electromagnet.
了
=
乛
+
亅
:
Sir Lancelot (l) has completed (了) his preparations to fight the world. There he stands ready, on top of the Elevator (e5), with a sickle (乛) and a crowbar (亅) in his hands.
to finish / to achieve / variant of 瞭|了[liao3] / to understand clearly
了
=
乛
+
亅
:
Mnemonic symbol from "to finish" and the shape of the character: a prize cup.
Li Qingzhao (li) is responsible for manufacturing a prize cup (了). She only needs to add a poetic engraving. Unfortunately, she suffers from a writer's block. In the aorta's living room (ao3), someone left a cryptic message engraved on the walls using a sickle (乛), which is still lying on the floor. Being an accomplished poet Li Qingzhao is able to understand the message clearly (了), realizes its poetic potential and starts to engrave it on the prize cup using a crowbar (亅).
"lid" radical in Chinese characters (Kangxi radical 8)
亠
=
丶
+
一
:
Mnemonic symbol: 亠 looks like a beret. Tecumseh (t) is killing time in the Outhouse's kitchen (ou2) by playing a game. His goal is to blow a petal leaf (丶) into a beret (亠) by blowing air through a flute (一).
哼
=
亨
+
口
:
In front of the engine ((e)ng1), Joseph Henry (亨) finally has the idea how to build his coil and exclaims "hurrah!", accidentally throwing away Hamlet's (h) mandarin (口) so Hamlet just says "humph!" (哼).