Fill character:
The fill character is defined as the ASCII representation of the hexadecimal digit 7C hex. It is represented in these MARC Help displays as < | >. A fill character may not be used in the Leader, or in tags, indicators, or subfield codes. A fill character may be used in a record when the format specifies a code to be used but the creator of the record decides not to attempt to supply a code.
The use of the fill character in records contributed to a national database is also dependent upon the national level requirements specified for each data element.
See also: