Category A Liaison
Can be established with standardisation bodies: ISO, IEC or ISO/IEC JTC1
"Category A Liaison" is granted to organizations that make an effective contribution to the work of the technical committee or subcommittee for questions dealt with by this technical committee or subcommittee. Such organizations are sent copies of all relevant documentation and are invited to meetings. They may nominate experts to participate in a Working Group/Project Team.
Source: ISO/IEC Directives, Part 1:2009 (Procedures for the technical work) (PDF format), subclause 188.8.131.52