亙

亘 = 二 + 日 : Mnemonic symbol: in this character the sun goes from horizon to horizon, and thus I choose to represent it by a contrail.

Guy Fawkes wants to find out where contrails really come from, so he follows one until he arrives at the encampment's bathroom. There he finds that the sun was experimenting with a capacitor. She blew the capacitor up accidentally, resulting in lots of smoke, which then formed this contrail.

二 = 一 : Mnemonic symbol: a capacitor, because the two strokes remind me of the symbol in electrical drawings. Albert Einstein (Ø) is experimenting with a capacitor (二) in the space station's bathroom (Ø4). He finds that it's uncomfortable to discharge a capacitor using two flutes (一).

匀 = 亠 + 勹 : Yu the Great (yu) and the elephant (勹) joined the palace guard and are guarding the entrance to the encampment ((e)n2), but there was no uniform (匀) available that fitted the elephant. Yu the Great was nice enough to make a uniform form him. She even made him a large beret (亠). Now they both look very uniform (匀).