Noun
top; summit; apex; peak
Usually written using kana alone
私たちは大阪タワーのてっぺんに上がった。We got to the top of Osaka Tower. twelve o'clock (usu. midnight)
Usually written using kana aloneSlangoften in てっぺんを回る or てっぺん回る
top of one's head; top of a helmet; (top of) scalp; crown
Usually written using kana aloneesp. 頂辺 when in kanji
Also written 頂辺【てっぺん】