That's not what ternary refers to here. In C, '+' is a binary operator because it accepts two inputs. '?:' is a ternary operator because it accepts three input

That's not what ternary refers to here. In C, '+' is a binary operator because it accepts two inputs. '?:' is a ternary operator because it accepts three inputs. It is usually referred to as the ternary operator because it is unique in C, but there's nothing fundamental about that. vpternlogd implements all bitwise ternary operators - those operators that accept three inputs.