binary max and binary min
In theoretical computer science, in the context of operators or functions, "binary" usually means "taking two arguments", whereas "Boolean" means "taking one of two values", especially if those values are true and false or $0$ and&nbsp;$1$.

So, for example, the ordinary addition operator on the natural numbers is binary (it adds two things) but not Boolean (the arguments can take infinitely many different values).  Conversely, the function $f(x,y,z)=(x\lor y)\land z$ is Boolean (its arguments are true/false) but not binary (it takes three arguments, not two; it's ternary).

"Binary" is also used to denote the base-$2$ number system but that doesn't seem relevant, here: min and max operate on numbers as abstract quantities, and the representation of those numbers (binary, decimal, Egyptian hieroglyphs, ...) is irrelevant.