Ruby Document format - Text markup language

Ruby Document format is a text markup language created in 1995.

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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. Read more on Wikipedia...

Ruby Document format Wikipedia page
Ruby Document format first developed in https://ml.ruby-lang.org/mailman3/hyperkitty/list/ruby-talk@ml.ruby-lang.org
See also: (3 related languages)Ruby, RDoc, Pod

Example from Wikipedia:

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