KanjiJLPT N3
Exist

exist, outskirts, suburbs, located in

Mnemonic

napoleon thrusts his stick deep into the earth and shouts: 'I exist!' As long as that stick remains planted in the earth, napoleon's presence is undeniable — proof he exists right here, right now.
Additional thoughts
Picture Napoleon on a battlefield, jamming his marshal's baton into the dirt like a flag claim. The stick in the earth is a territorial marker — a physical statement of existence.
Quick recall
napoleon drives his stick into the earth to prove he exists.

Details

The keyword for 在 is exist. This kanji conveys the fundamental concept of being, existing, or being present in a particular place. It is used to indicate that something is located somewhere or that someone resides in a certain location. More broadly, it encompasses the idea of existence itself, affirming that something is real or currently in a state of being.
On'yomi
ざい
Kun'yomi
あ.る