Jōyō kanji, Taught in junior high
JLPT level: N1
968 of 2500 most used kanji in newspapers
Stroke count: 15
Meaning: penetrate, clear, pierce, strike home, sit up (all night)
Kunyomi:
Onyomi: テツ
Composition: 彳
Radical: 彳
Meaning: step
徹夜 (テツヤ) staying up all night
徹カラ (テツカラ) all-night karaoke
冷徹 (レイテツ) cool-headed, level-headed, hard-headed
透徹 (トウテツ) penetration, absolutely clear, not dirty, clearness