> What's the hash mark signify when used as a prefix to a method
> name,

The hash mark signifies that it is a symbol.

Another word for "method name" is "selector". You sometimes see this
in comments in the code. For example, see the method
#addSelector:withMethod: in Behavior. A "selector" is always a
symbol. This means that the name of a method is always a symbol.

If I were writing a paper on Smalltalk and wanted to mention a method
name, I'd probably make it bold face, but when I am using plain ASCII,
like in e-mail or a Smalltalk comment, I'll put a hash mark before the
method name to indicate that it is a symbol.

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