KanjiJLPT N2
Edge

edge, origin, end, point, border, verge, cape

Mnemonic

You stand atop a mountain where a vast curtain of fog suddenly parts, revealing the sheer edge of the world itself. Beyond that edge there is nothing but void. The curtain sways in the wind, daring you to step one inch closer to the edge.
Additional thoughts
Picture yourself standing on the world's highest mountain peak. A curtain of mist rolls back like a theater reveal, exposing the clean, absolute drop-off—the definitive edge of existence. The three radicals stack visually: stand on top, mountain in the middle, curtain below.
Quick recall
Stand on a mountain as a curtain of fog reveals the edge of the world.

Details

The keyword for 端 is edge. This kanji refers to the very tip, border, or extremity of something—the point where an object or area comes to an end. It conveys the idea of a boundary, margin, or outermost part, such as the edge of a table, the end of a road, or the fringe of a group. By extension, it can also imply something proper or correct, as in being "upright" or "straight," since an edge represents a clean, defined line.
On'yomi
たん
Kun'yomi
はし、は、はた、-ばた、はな