~間
~かん · ~kan · JLPT N2 · noun
between
🚪☀️ 間 = 門 gate + 日 sun: sunlight shining through the gap between the doors
As a suffix, ~間 (kan) marks a span of time or space: 三日間 = for three days, 東京・大阪間 = between Tokyo and Osaka. The gap in the gate is the stretch between two points.