What does ガンマ mean?
ガンマ is a Japanese noun meaning “gamma” in English. It is written as ガンマ in hiragana, and ganma in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
トップのリーダーは犬の行動学では「アルファ」と呼ばれ、以下「ベータ」「ガンマ」と続きます。
In dog ethology the leader is called 'alpha', after that it continues with 'beta' and 'gamma'.