KanjiJLPT N1
Well

well, well crib, town, community

Mnemonic

Four strokes forming a tic-tac-toe grid — the wooden frame under a well.

Details

The keyword for 井 is well. This kanji depicts the wooden framework of an old-fashioned water well as seen from above, with its cross-shaped support beams forming four compartments. In addition to referring to a literal well for drawing water, it can also convey the idea of a town or community, since in ancient times settlements were often organized around a shared well.
On'yomi
せい、しょう
Kun'yomi