The kanji 碁 primarily means "Go," the ancient board game of strategy. It represents the game itself and everything associated with it, including the board, stones, and the act of playing.

・On-yomi (音読み): ゴ (go) ・Kun-yomi (訓読み): None (usually written as 碁)

⚫︎囲碁 Translation: Go (the board game) ⚫︎碁石 Translation: Go stone(s) ⚫︎碁盤 Translation: Go board

The kanji 碁 is a 形声文字 (keisei moji), a phono-semantic compound. The upper part is 其, representing the sound キ (ki) and also the meaning. The lower part is 石, meaning "stone." Thus, the character combines the phonetic element 其 and the semantic element 石, representing the stones used in the game of Go. This structure indicates that the character is closely related to "stones" and is therefore used to refer to the game using stones on a board.