The following typographical conventions are used throughout displays in MARC Help:

0  =  The graphic 0 represents the digit zero in tags, fixed-position character positions, indicator positions, and other places numerics are used.  This character must be distinguished from an uppercase letter O in examples or text.

#  =  The graphic symbol # is used for a blank in coded fields and in other special situations where the existence of the character blank might be ambiguous.  (In most textual examples, the blank is represented in the conventional way, by the absence of a character.)

_  =  The graphic symbol _ (underscore character) is sometimes used in this Help to represent a blank in coded fields and in other special situations where the existence of the character blank might be ambiguous.

$  =  The graphic symbol $ is used in this online Help to represent the delimiter portion of a subfield code.  Within the text, subfield codes are referred to as subfield $a, for example.

/  =   Specific character positions of the Leader, the Directory, field 007, field 008, subfield $7 of the linking entry fields (760-787), and subfield $w are expressed using a slash and the number of the character position, for example, Leader/06, $w/0.

1  =  The graphic 1 represents the digit one (hex 31).  This character must be distinguished from a lowercase roman alphabet letter l (hex 6C, letter "el") and uppercase alphabetic letter I (hex 4C, letter "eye") in examples or text.

|  =   The graphic vertical bar | represents a fill character in MARC examples.

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A General Introduction to the MARC Format