天辺

てっぺん · てへん · てっぺい also 頂辺

1. noun, usually in kana top; summit; apex; peak
2. usually in kana, slang, often in てっぺんを回る or てっぺん回る twelve o'clock (usu. midnight)
3. usually in kana, esp. 頂辺 when in kanji top of one's head; top of a helmet; (top of) scalp; crown

てんぺん

1. noun high in the sky; highest heaven