class Demo
  # The stuff we'll look up.
  DEFAULT = "Hello"
  def initialize
    @message = DEFAULT
  end
  def say() @message end

  # Use symbols to look up identifiers.
  def look_up_with_symbols
    [Demo.const_get(:DEFAULT),
     method(:say),
     instance_variable_get(:@message)]
  end
end

dem = Demo.new
puts dem.look_up_with_symbols

Hello
#<Method: Demo#say>
Hello

myobject.methods  # show a list of instance methods an object has (like "say" above)
myobject.instance_variables  # show a list of instance variables an object has (like "@message" above)
myobject.class.constants  # show a list of class level constants (like "DEFAULT" above)