Reference operator (unary): passing a variable by reference instead of by value.
Index operator (binary): accesses a specific element of an array, string, numeric or object.
Literal array: encloses values for literal arrays.
Delimiting characters for literal code blocks.
Plus operator (unary): defines the sign of numeric values.
Increment operators (unary): increase numeric or date value by one.
Less than operator (binary): size comparison of two values.
Less than or equal to operator (binary): size comparison of two values.