Is there a specific way of referring to physics before relativity and quantum theory? Whenever I want to refer to this category of physics my tongue keeps slipping and I keep saying "classical physics." Every single time I have to correct myself. I was tempted to say Newtonian physics, but there was much of pre-relativity and pre-quantum physics for which Newton was not responsible for, for example, Hamiltonian & Lagrangian mechanics, Electromagnetism, Thermodynamics. So what do I call classical physics without relativity?