彗
スイ, エ, ケイ, セイ, ほうき, とし
comet
JLPT1 G13 S0 F2294
The relevant seal inscription form shows 又# hand wrapped around the bamboo handle of a *broom* (compare 帚) → *brush*; *sweep*. *Comet* is via assigning 彗 the signification of the compound 彗星.
[Full Kanji Etymology List]