const unicode/utf16.replacementChar

7 uses

	unicode/utf16 (current package)
		utf16.go#L13: 	replacementChar = '\uFFFD'     // Unicode replacement character
		utf16.go#L41: 	return replacementChar
		utf16.go#L49: 		return replacementChar, replacementChar
		utf16.go#L90: 			a[n] = uint16(replacementChar)
		utf16.go#L111: 	return append(a, replacementChar)
		utf16.go#L139: 			ar = replacementChar

The pages are generated with Golds v0.7.6. (GOOS=linux GOARCH=amd64)