What is the meaning of γάμα?

gamma, the third letter of the modern Greek alphabet.

L-shaped as in σχηματίζω Γ.

second-person singular imperfective imperative of γαμάω (gamáo) and γαμώ (gamó)

second-person singular perfective imperative of γαμάω (gamáo) and γαμώ (gamó)

Source: wiktionary.org