I am now in another hole, though I have to say, it is no better than the old one. Living with human beings is hard! - Ludwig Wittgenstein

This remark provides the key to the problem, how much truth there is in solipsism. For what the solipsist means is quite correct; only it cannot be said, but makes itself manifest. The world is my world: this is manifest in the fact that the limits of language (of that language which alone I understand) mean the limits of my world. (5.62)

In order to avoid these errors, we must employ a symbolism which excludes them, by not applying the same sign in different symbols and by not applying signs in the same way which signify in different ways. A symbolism, that is to say, which obeys the rules of logical grammar — of logical syntax. (The logical symbolism of Frege and Russell is such a language, which, however, does still not exclude all errors.)

If a sign is not necessary then it is meaningless. That is the meaning of Occam’s razor. (If everything in the symbolism works as though a sign had meaning, then it has meaning.)