垓 border; boundary; staircase; hundred quintillion 9 strokes. Readings ガイ (on reading): 垓 (がい) 10^20 カイ (on reading) はて (kun reading) Components 土 亥 ノ radical slash, katakana no 丶 radical dot 亠 radical lid 人 radical person 土 radical earth Words using 垓 垓 (がい) 10^20 Jinuma: Japanese Dictionary · Word lists