KanjiJLPT N5
InRadical: Inside

in, inside, middle, mean, center

Mnemonic

A mouth hangs open and someone shoves a stick right in. The stick lodges dead center, splitting the mouth perfectly in half. Picture that stick standing tall in the middle of the mouth—stuck in, right in the center of everything.
Additional thoughts
The kanji 中 literally looks like a stick piercing through the center of a mouth (box). The vertical line through the rectangle is unmistakable. Center and in share the same idea of interiority.
Quick recall
A stick shoved in through a mouth, lodged dead center.

Details

The keyword for 中 is in. This kanji represents the concept of being inside, within, or in the middle of something. It depicts the idea of a central point or interior space, conveying both physical location (such as being inside a container) and more abstract meanings like "during" a period of time or "among" a group. It is one of the most fundamental kanji, frequently used to express the notion of centrality and interiority.
On'yomi
ちゅう
Kun'yomi
なか、うち、あた.る