蛍

Kanji: 蛍
Level: N1
Meaning: firefly
On'yomi: ケイ
Kun'yomi: ほたる
Strokes: 11
Common compounds: 蛍雪 (けいせつ, diligent study) ホタル (firefly)
Memory hook: An insect (虫) carrying fire (火) to shine as a firefly (蛍).