coiled up
蟠 centers on the idea of being coiled or curled up, like a snake or insect in a tight spiral. The meaning extends to a curled-up posture or a tangled, knotted state.
蟠 combines 虫 (insect/reptile) with 番, which likely contributes the sound. The character suggests a creature coiling or curling up.
The insect radical 虫 beside 番 (which can suggest a repeated pattern) gives the image of a bug curling into a tight spiral, like a pillbug rolling up.
For ハン, imagine a coiled snake hissing 'han' as it tightens its coils: han -> ハン, and the snake is coiled up.
bad feeling; cares; ill feeling; grudge; sense of discomfort; discontent; reserve
with no ill feeling; openly; without reserve
to be harboured (of negative feelings or thoughts); to be rooted in one's mind; to lurk
donut peach (Amygdalus persica var. compressa); UFO peach; flat peach; pan tao peach; Saturn peach; saucer peach
becoming firmly established; putting down strong roots
coiled dragon; dragon coiled on the earth, which has not yet ascended to the sky