Justin wrote:

> There is a link to "Object#kind_of?" which is an instance method. 
> Clearly the purpose of the hash mark has another purpose.  Anyone know 
> what document explains this?

The notation's explained in the preface:

http://www.rubycentral.com/book/preface.html#S10

Basically it means "the instance method kind_of? implemented by the 
Object class"; not really syntax, but convention for discussing Ruby. 
The 'ri' utility uses something similar.

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