to hand over / to deliver / to pay (money) / to turn over / to make friends / to intersect (lines) / variant of 跤[jiao1]
交
=
亠
+
父
:
Linus Pauling, a famous scientist with a beret. Father Time commands Linus Pauling to hand over his beret to him in front of the aorta, but Joan of Arc comes to his rescue.
to exchange / to change (clothes etc) / to substitute / to switch / to convert (currency)
换
=
奂
+
扌
:
Helga Horse (hu) received two new toy claws (扌) and tests them in the anthill's bathroom (an4). To test whether they are the same, she repeatedly exchanges (换) them and weighs them in her hands. She then makes both tips of the claws touch and quietly whispers "excellent" (奂).
weight / number / code / to pile / to stack / classifier for length or distance (yard), happenings etc
码
=
石
+
马
:
Just when Mahatma Gandhi (m) and the unicorn (马) entered the ashram (a3) a giant rock (石) fell down and trapped them inside. There is an inscription written on it: if they ever want to leave, they will have to find the secret number (码) and say it out loud. There is also a hint: "how many roads must a man walk down?"
Standard Interchange Code for Generally Used Chinese Characters, a character encoding standard of Taiwan 1986-1992, aka CNS 11643-1986, where CNS stands for Chinese National Standard / abbr. to 通用碼|通用码[Tong1 yong4 ma3]