2+2 - Two plus two 2*2 - Two times two 4/3 - Four divided by three (or simply just "four over three") 2^2 - Two squared √2 - Root two 2+2=5 - Two plus two equals five 2<3 - Two is less than three 3>1 - Three is greater than one 2<=x - Two is less than or equal to x 2 ≠ y - Two doesn't equal y Most people would call both "(...)" and "[...]" brackets, but some people would argue that the former should technically be called "rounded brackets" or "parentheses", and the latter "square brackets". The distinction is important in programming, but otherwise if you just say "brackets" most people would assume you're referring to these: (...).

2+2 (two plus two), 2*2 (two times two, two multiplied by two, or two twos), 4/3 (four-thirds, or four over three), 2^2 (two squared, or two raised to the power of two), √2 (square root of two, or root two), 2+2=5 (two plus two equals five, or two plus two is five), 2<3 (two is less than three), 3>1 (three is greater than one), 2<=x (two is less than or equal to x, or two is not greater than x), 2 ≠ y (two is not equal to y), () (open/close parenthesis, or parentheses), [ ] (open/close bracket, or open/close square brackets, or brackets, or square brackets). Lots more info here: https://en.wikipedia.org/wiki/List_of_mathematical_symbols :)