-is known but which is not available in the editor being used, enter
-
-@example
-#(ly:export (ly:wide-char->utf-8 #x03BE))
-@end example
+is known but which is not available in the editor being used, use
+@code{\char ##xhhhh} within a @code{\markup} block, where
+@code{hhhh} is the hexadecimal code for the character required.
+For example, @code{\char ##x03BE} enters the Unicode U+03BE
+character, which has the Unicode name @qq{Greek Small Letter Xi}.
+Any Unicode hexadecimal code may be substituted, and if all special
+characters are entered in this format it is not necessary to save
+the input file in UTF-8 format. Of course, a font containing all
+such encoded characters must be installed and available to LilyPond.
+
+The following example shows UTF-8 coded characters being used in
+four places -- in a rehearsal mark, as articulation text, in lyrics
+and as stand-alone text below the score: