芯

Kanji: 芯
Level: N1
Meaning: wick
On'yomi: シン
Strokes: 7
Common compounds: 芯 (しん) core 鉛筆の芯 (えんぴつのしん) pencil lead
Memory hook: Grass (艹) on a heart (心) forming the core (芯) or wick.