run, simplified form of kanji for luck, fortune, ship, transport
运 centers on movement and conveyance: running, shipping, or transporting things. The fortune/luck sense comes from its use as a simplified form of 運, where movement extends to the flow of fate.
运 is a modern simplified form of 運. The traditional form 運 combines 辶 (movement) with 軍 (army), suggesting organized movement or transport. The simplified form replaces 軍 with 云, likely for phonetic similarity and stroke reduction.
The movement radical 辶 wraps around 云, like a cloud being carried by the wind. Picture a cloud running across the sky, transporting rain and fortune.
For ウン, imagine a running cloud that brings good luck: the sound 'oon' (like 'moon' without the 'm') cues ウン, and the cloud moves swiftly.