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The fill character is intended to be used in those circumstances where it is not possible to assign the correct value to a coded data item. This may occur, for example, when there is no corresponding value at all in the source format. The fill character is a graphic character in ISO 646: "|" (vertical line), position 7/12 in the 7-bit code table.
The fill character may not be used in the Record Label, Directory, tag or textual data. It may not be used to replace a mandatory coded data element, a subfield identifier, punctuation or other special characters, or all codes in an optional coded field (the field should not be used).
http://www.ifla.org/VI/3/p1996-1/sectn4.htm

дали може да се преведе като служебен символ/знак, или си има термин на бг