Mapping # in file using type_table_path

I'm using the word_delimiter filter and wanted to create a type_table_path file to store my mappings. Howerver, one of my mappings is for the hash sign (#).

How can I prevent the parser from treating this line as a comment?

# Mapping some characters to ALPHA.
@ => ALPHA
# => ALPHA

Try \u0023 => ALPHA.

That worked, thanks Nik!