sail
颿 centers on the idea of a sail, specifically a sail driven by wind, as suggested by its components.
颿 combines 馬 (horse) and 風 (wind), likely suggesting a horse running like the wind or a sail driven by wind. The exact historical development is uncertain.
A horse (馬) running with the wind (風) behind it, like a sail catching the breeze.
For ハン, imagine a sailboat with a huge sail shaped like a hand (ハン) catching the wind.