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replacement 

        # Encoding::Converter.replacement

(from ruby core)
### Implementation from Converter
---
    ec.replacement -> string

---

Returns the replacement string.

    ec = Encoding::Converter.new("euc-jp", "us-ascii")
    p ec.replacement    #=> "?"

    ec = Encoding::Converter.new("euc-jp", "utf-8")
    p ec.replacement    #=> "\uFFFD"

This is MURDOC! A Ruby documentation browser inspired by Smalltalk-80. It allows you to learn about Ruby by browsing through its class hierarchies, and see any of its methods.