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wikipedia https://en.wikipedia.org/wiki/Ruby_Document_format
example
here.is_a?(Piece::Of::Code)
print <<"END"
This indented block will not be scanned for formatting
codes or directives, and spacing will be preserved.
END
related ruby rdoc pod
summary RD (Ruby Document) is a lightweight markup language for writing Ruby-related documents. It can be embedded in Ruby source code. RD is a traditional format. In modern Ruby, developers tend to write documents in RDoc instead of RD.