%isoamsn; — Added Math Symbols: Negated Relations Character Entities
The %isoamsn; parameter entity includes the ISO character entities with the public identifier:
ISO 8879:1986//ENTITIES Added Math Symbols: Negated Relations//EN
ISO and the W3C are cooperating to provide an official set of character entity references for XML. A description of this set is available at http://www.w3.org/2003/entities/iso8879doc/isoamsn.html