壱

Kanji: 壱
Level: N1
Meaning: one
On'yomi: イチ
Kun'yomi: ひとつ
Strokes: 7
Common compounds: 壱万円 (いちまんえん) ten thousand yen 壱岐 (いき) Iki Island
Memory hook: This is the formal character for one, used on legal documents to prevent tampering.