describe-char-unicodedata-file

describe-char-unicodedata-file is a variable defined in `descr-text.el'.
Its value is

nil

Documentation:
Location of Unicode data file.
This is the UnicodeData.txt file from the Unicode Consortium, used for
diagnostics. If it is non-nil `describe-char' will print data
looked up from it. This facility is mostly of use to people doing
multilingual development.

This is a fairly large file, not typically present on GNU systems.
At the time of writing it is at the URL
`http://www.unicode.org/Public/UNIDATA/UnicodeData.txt'.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 22.1 of Emacs.