Hooke's law Memes

Physicists have a WILD obsession with the letter K! While normal humans use x, y, or z for variables, physicists turn their heads so fast for K you'd think it was free pizza at a conference! Why? Because K represents the coveted spring constant in Hooke's Law, Boltzmann constant in thermodynamics, and wave number in quantum mechanics. Other letters? Pfft! They might as well be invisible! The betrayal of alphabetical proportions!