Prohibit, Prohibition
Killing two trees with a jackhammer is expressly prohibited. Don't get me wrong, you can rip up one tree with your jackhammer, but not two.
Imagine standing in front of a forest with your jackhammer, staring at a sign with just this kanji on it. Tree plus tree with jackhammer equals prohibited. Hmm.
きん
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The person who decided to prohibit jackhammering two trees is the King (きん) of England. He's the only person who's able to prohibit certain things, so it had to be him.
Picture the King angrily covering his ears as his subjects jackhammer trees. He screams and shouts, his crown bouncing on his head, and points at his new sign that prohibits the jackhammering of trees.