That's more of a problem in text-based coding. One of the things I genuinely like about Snap (well, in my case NetsBlox, which is a fork of it) is the ability to have spaces and weird characters in a variable name.

Edit: Oh, you meant the lambda in the post title? It's not really part of the name, but you can at least type it into Snap itself.

> Any name that you can't type is going to be a problem.

Fortunately the name is Snap! so typing it isn't much of a problem. (With the !, which was stripped from the submission title and when most people write about it.)