Question

What are CURLY BRACKETS { } ?

Answer 1

Alternatively referred to as an open brace, close brace.

They are used to group identites.

When used in a mathematical expression, left "{" curly brackets, and right "}" curly brackets are used together. They can be interchanged with parenthesis or squarebrackets. However, if there are three levels of grouping in a nested expression, generally parentheses are used in the inner most groupings.