What is the meaning of γάμα?

gamma, the third letter of the modern Greek alphabet.

L-shaped as in σχηματίζω Γ.

2nd person singular imperfective imperative form of γαμάω (gamáo) and γαμώ (gamó).

2nd person singular perfective imperative form of γαμάω (gamáo) and γαμώ (gamó).

Source: wiktionary.org