About
垓 originally meant a boundary or the edge of land. This phono-semantic compound combines the semantic radical 土 (earth), indicating a connection to land or territory, with the phonetic component 亥 (hài). The character is famously known from the place name Gaixia (垓下), the site of a decisive ancient battle. It was also adopted into the traditional Chinese numerical system to represent an extremely large number, one hundred million (10^8) or, in some historical contexts, one hundred million squared (10^16). This mathematical use significantly expanded the character's meaning beyond its original geographical sense.
Etymology Hide
