As of October 22, the following characters will be allowed in records contributed to the LC/NACO Authority File (see the code tables at www.loc.gov/marc/specifications/specchartables.html for encoding information):

• Spacing underscore
• Spacing grave
• Opening curly bracket
• Closing curly bracket
• Spacing tilde
• Degree sign
• Lower case script L
• Phono copyright mark
• Copyright mark
• Sharp
• Inverted question mark
• Inverted exclamation mark

Implementation of a few other newer characters is deferred at this time. A separate announcement will be made when the Eszett (continue to use ss per LCRI 1.0E) Euro Spacing circumflex may be used. The Library of Congress will work with OCLC to identify and convert existing NACO authority records using the number sign for the musical sharp and superscript zero for the degree sign.

These new characters may also now be found in LC-issued bibliographic records. As part of this implementation, LC has revised LCRI 1.4F5 — describing LC's practice for continued use of the letters c and p for the copyright and phono copyright symbols in 260 $c. For efficiency, LC's catalogers will generally follow this same practice in $a of authority 670 citations.