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Operators must be defined on values of specific types. For instance, + is defined on numbers, but not on characters or other non- arithmetic types. Operators are often defined on groups of types.

The exponentiation operator. It raises the first operand to the power of the second one.
The range operator. Normally used in the form of array(low:high) to represent a section of array.
The access component operator. Normally used to access elements in derived types. Also suitable for unions. As unions aren't part of regular Fortran, this can only happen when accessing a register that uses a gdbarch-defined union type.