4.24 Names are simple symbols. I indicate them by single letters (“x,” “y,” “z”).
I write an elementary proposition as a function of names, in the form: “fx,” “ø(x,y),” etc.
Or else I indicate it by the letters p, q, r.
Black (p. 209) notes that this seems to conflict with 3.202 and 3.26. There, Wittgenstein says that names are signs.