In Portuguese they are called "keys", so you just use open-key and close-key, but I understand that that in English would be confusing.
Anyway, I don't get this, just as a joke. "Parenthesis", "Brackets" and "Braces" do just fine, thank you very much.
() Parenthesis => Parêntesis [] Brackets => Colchetes {} Braces => Chaves