Brackets, Parentheses, Braces

[] brackets (US), square brackets
() parentheses, brackets (non-US English), round brackets
<> angle brackets
{} curly braces (US), curly brackets

Parenthesis is the singular of parentheses (short: parens)! ;)

Source: https://twitter.com/gfixler/status/926950212760870913, https://en.wikipedia.org/wiki/Bracket