It is a unary operator, from my understanding of operators, as it only operators on one subject (~2). However, I very much doubt TC39 would use this character,

It is a unary operator, from my understanding of operators, as it only operators on one subject (~2). However, I very much doubt TC39 would use this character, as it would cause a great deal of confusion and poor semantics, not to mention the complexity on the engine side (does the user want NOT or pipe?)